Multiple teams: add new database structure
WIP adding support for multiple teams in the different screens
Fix some upgrade crashes
Sort members by name ignoring case
Created method in ScrumChatterDialog to show a dialog with an edit text, and to validate the input
WIP menu items to switch, rename, and delete teams
Corrections for switching and renaming teams
Implemented deleting a team
Some improvements for team management
More improvements for team management
For the delete and rename team menu items, show the team name
Fixed some db import issues related to multiple teams
Updating icons for teams
Fixing transparency of new meeting action icon
Some cleanup related to multi team
Excel export: one worksheet per team
New version 1.0.5
Fix for crash which I can't reproduce: in MeetingsListFragment, unregister the shared preference listener in onDetach
New version 1.0.6
Some cleanup of constants