[sugar] obsolete activity bundles are being packaged into current Joyride builds

[Mikus Grinbergs]

Happened to notice *two* entries for the same Activity (different 
versions) in the list view of Home.  [I don't know *how* that 
happened to come about.]  Investigated, and found that while I had 
manually (with 'sugar-install-bundle) installed the current version 
of that Activity, there was also an obsolete version of that same 
Activity contained in /usr/share/activities/bundle-archive/bundles.

mikus