FileBrowser window tweaks: Can be called from a dialog.
Windows can be called as dialogs with show(modal=True)
askPath: Method to ask for a path (PATH, FOLDER or BASENAME)
backup: Method in pyworkflow.utils.path to backup files
All variables are centralized and Plugin._defineVar or _defineEmVar accept variable description, and type (VarTypes enum) to better describe the variable.
… project window.