check status before merge v3

[fwyzard]

• clean up some unused variables from git-cms-addpkg
• limit the check of the local tree to the index (staged but not committed files)

[fwyzard]

Hi @smuzaffar , could you merge this?

I'd like to have it in the master in order to ask Bill and few other core developers to test the changes.

Ciao, .Andrea