Added groups constants and visibility flags.
Added groups constants and visibility flags.

Wrote code to support groups and slightly modified existing
group membership definition.  Each group has a TITLE, or a
TITLE_RESOURCE which can point to a localized title from
the owning package.

Adds summary Uri with columns that describe the contents of
all returned groups, such as people counts.

Added visibility flag to groups and aggregate tables to
prepare for group management UI.

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base