No nagging of broken add-ons

6a32b3a no longer attempts to auto-install add-ons that are broken due to unmet dependencies.

fd1b15e removes the unnecessary bump of xbmc.python's minimum version that lead to all the nagging.  The add-ons still work, so the backward compatibility is fine.  Get the add-on authors to update their version requirements on submission rather than nagging thousands (soon to be millions) of users about it.