Correction to solve failing installer build from any gitflow release branch. Modification git.branch to remove any \ or  / . Those characters could be interpreted as file separator.  Property git.commit based on git.branch is used as part of target file. The build path refer an unexpected and inexisting subdirectory.
Correction to solve failing installer build from any gitflow release branch. eg: release/eXist-2.2-Dev.RC1
Modification git.branch to replace any \ or / by _.
Those \ and / characters could be interpreted as file separator.
Property git.commit, based on git.branch, is used as part of installer target filename. By consequence, the build path refer an unexpected and inexisting subdirectory.
Merge branch 'feature/BuildFromFlowReleaseCorrection' of https://github.com/pcolot01/exist into feature/BuildFromFlowReleaseCorrection

Conflicts:
	build/scripts/git-support.xml
Merge branch 'feature/BuildFromFlowReleaseCorrection' into release/eXist-2.2-Dev.RC1