Better function names.

get/setCurrentProject() function name is
misleading, get/setCurrentProjectName
is more accurate.
Adding the ability to change the separator string at the API level and through the Qt GUI.  For example, "_" for backwards compatability or "." for future uses
Merge branch 'XL' of https://github.com/arborworkflows/ProjectManager

Conflicts:
	tangelo/ArborFileManagerAPI.py

merged in Xiaoxiao's pull request to improve method names.