Partial overhaul of filtering for sessions.
Fixing overhaul for filtering sessions.
Removed dependency on entirely linear lists.

Now that the list of sessions contains all of the sessions available, I
had to refactor since I previously assumed that there would be a one to
one relationship between the bubbles/markers list indices and the
session list indices.
Fixed session creation bugs

There were a few new session creation bugs caused by the sessions
refactor. Everything seems to work as expected now.
Cosmetic modifications to infowindows.