Shorten excessively long lines

- Some lines in the files were excessively long, even in the context of the Cura project which seems to prefer a long line length.
These lines could not be read easily even on github .... 
- Removed some unnecessary whitespaces
- Added some extra spaces so that inline comments are separated by at least two spaces from the statement

cura/LayerPolygon.py

@@ -24,9 +24,12 @@ class LayerPolygon:
     PrimeTowerType = 11
     __number_of_types = 12
 
-    __jump_map = numpy.logical_or(numpy.logical_or(numpy.arange(__number_of_types) == NoneType, numpy.arange(__number_of_types) == MoveCombingType), numpy.arange(__number_of_types) == MoveRetractionType)
+    __jump_map = numpy.logical_or(numpy.logical_or(numpy.arange(__number_of_types) == NoneType,
+                                                   numpy.arange(__number_of_types) == MoveCombingType),
+                                                   numpy.arange(__number_of_types) == MoveRetractionType)
 
-    def __init__(self, extruder: int, line_types: numpy.ndarray, data: numpy.ndarray, line_widths: numpy.ndarray, line_thicknesses: numpy.ndarray, line_feedrates: numpy.ndarray) -> None:
+    def __init__(self, extruder: int, line_types: numpy.ndarray, data: numpy.ndarray,
+                 line_widths: numpy.ndarray, line_thicknesses: numpy.ndarray, line_feedrates: numpy.ndarray) -> None:
         """LayerPolygon, used in ProcessSlicedLayersJob
 
         :param extruder: The position of the extruder
@@ -63,9 +66,11 @@ class LayerPolygon:
         self._color_map = LayerPolygon.getColorMap()
         self._colors = self._color_map[self._types]  # type: numpy.ndarray
 
-        # When type is used as index returns true if type == LayerPolygon.InfillType or type == LayerPolygon.SkinType or type == LayerPolygon.SupportInfillType
+        # When type is used as index returns true if type == LayerPolygon.InfillType
+        # or type == LayerPolygon.SkinType
+        # or type == LayerPolygon.SupportInfillType
         # Should be generated in better way, not hardcoded.
-        self._is_infill_or_skin_type_map = numpy.array([0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0], dtype = bool)
+        self._is_infill_or_skin_type_map = numpy.array([0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0], dtype=bool)
 
         self._build_cache_line_mesh_mask = None  # type: Optional[numpy.ndarray]
         self._build_cache_needed_points = None  # type: Optional[numpy.ndarray]
@@ -80,12 +85,14 @@ class LayerPolygon:
         # Only if the type of line segment changes do we need to add an extra vertex to change colors
         self._build_cache_needed_points[1:, 0][:, numpy.newaxis] = self._types[1:] != self._types[:-1]
         # Mark points as unneeded if they are of types we don't want in the line mesh according to the calculated mask
-        numpy.logical_and(self._build_cache_needed_points, self._build_cache_line_mesh_mask, self._build_cache_needed_points )
+        numpy.logical_and(self._build_cache_needed_points, self._build_cache_line_mesh_mask, self._build_cache_needed_points)
 
         self._vertex_begin = 0
         self._vertex_end = cast(int, numpy.sum(self._build_cache_needed_points))
 
-    def build(self, vertex_offset: int, index_offset: int, vertices: numpy.ndarray, colors: numpy.ndarray, line_dimensions: numpy.ndarray, feedrates: numpy.ndarray, extruders: numpy.ndarray, line_types: numpy.ndarray, indices: numpy.ndarray) -> None:
+    def build(self, vertex_offset: int, index_offset: int, vertices: numpy.ndarray,
+              colors: numpy.ndarray, line_dimensions: numpy.ndarray, feedrates: numpy.ndarray,
+              extruders: numpy.ndarray, line_types: numpy.ndarray, indices: numpy.ndarray) -> None:
         """Set all the arrays provided by the function caller, representing the LayerPolygon
 
         The arrays are either by vertex or by indices.
@@ -114,7 +121,7 @@ class LayerPolygon:
         # Index to the points we need to represent the line mesh. This is constructed by generating simple
         # start and end points for each line. For line segment n these are points n and n+1. Row n reads [n n+1]
         # Then then the indices for the points we don't need are thrown away based on the pre-calculated list.
-        index_list = ( numpy.arange(len(self._types)).reshape((-1, 1)) + numpy.array([[0, 1]]) ).reshape((-1, 1))[needed_points_list.reshape((-1, 1))]
+        index_list = (numpy.arange(len(self._types)).reshape((-1, 1)) + numpy.array([[0, 1]])).reshape((-1, 1))[needed_points_list.reshape((-1, 1))]
 
         # The relative values of begin and end indices have already been set in buildCache, so we only need to offset them to the parents offset.
         self._vertex_begin += vertex_offset
@@ -138,11 +145,12 @@ class LayerPolygon:
         # Convert type per vertex to type per line
         line_types[self._vertex_begin:self._vertex_end] = numpy.tile(self._types, (1, 2)).reshape((-1, 1))[needed_points_list.ravel()][:, 0]
 
-        # The relative values of begin and end indices have already been set in buildCache, so we only need to offset them to the parents offset.
+        # The relative values of begin and end indices have already been set in buildCache,
+        # so we only need to offset them to the parents offset.
         self._index_begin += index_offset
         self._index_end += index_offset
 
-        indices[self._index_begin:self._index_end, :] = numpy.arange(self._index_end-self._index_begin, dtype = numpy.int32).reshape((-1, 1))
+        indices[self._index_begin:self._index_end, :] = numpy.arange(self._index_end-self._index_begin, dtype=numpy.int32).reshape((-1, 1))
         # When the line type changes the index needs to be increased by 2.
         indices[self._index_begin:self._index_end, :] += numpy.cumsum(needed_points_list[line_mesh_mask.ravel(), 0], dtype = numpy.int32).reshape((-1, 1))
         # Each line segment goes from it's starting point p to p+1, offset by the vertex index.