* #4620
Invalidate posDetectSurfaces during make_perimeters() when posSlice would also get invalidated.
Can't use invalidate_step() as that invalidates the perimeters as well.
* Add a test step to check for regression #4620 - behavior on running Print::process() again on the same model.
* Fix naming scheme for macos/osx builds to make it obvious if it is a PR or not.
* Remove previous versions of the same kind of branch or PR ID
* Adjust copied statements to account for different calling conventions; osx does not have an arch name argument for make_dmg
* Remember to set the version too
* Update windows build server command to clean up old branch builds.
* Specifically look for PR${PR_ID} instead of just ${PR_ID} to avoid unintentional deletions.
* don't symlink pull requests
* Update to call more functions on osx
* Only delete/clean once, not once per file uploaded.
* Deploy PRs to branches/ subdir.
* wrong path to util
* added PR number to file name
* check for appveyor pr variable
* also use branches if pushing a branch on windows
* also use branches if pushing a branch on unix
* wrong or operator on powershell
* only decrypt if the key is available
* Use script instead of explicit command
* Don't deploy if the keyfile is missing/empty.
* Don't deploy if key is not available.
* Don't decrypt appveyor key if no secret
* wrong name
* Fix the logic and a typo
