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Add Global, Venue classes as new approach to data handling

Migrate MapActivity, others still are pending.  Add free RFC 3339 date
parsing code from http://cokere.com/RFC3339Date.txt
Replace Chad Okere's RFC 3339 parsing code by my own ...

... which (hopefully) is less broken.  Major differences are:
* 'Z' time zone is treated as UTC instead of local time zone
* fractional seconds are not parsed instead of parsing them wrongly
* pure dates, without time information, are accepted as well because that is
  what vegguide.org sends for closed_date
Add JUnit tests for Rfc3339
Add map click handler, convert EntryActivity to use Venue
Merge remote branch 'origin/cleanup' into cleanup
Fix bug in venue.setId() and add JUnit test
Improve logging a bit
Move JSON parsing from MapActivity to Venue

Add parsing code for all currently existing members of Venue (but more
members need to be added to Venue).
Split Ymd parser off RFC3339 parser, use it for close_date
Update TODO
Move server interactions to Global.java ...

... to prepare using the same loader for ListView and MapView.
remove useless import
add Venue.closed() method
skip map display of closed venues
Switch to MapView as default view
Add category support to Venue
Minor code simplification
Implement category filtering in MapView (work in progress)

This involves moving filter-related things from MyData to Global, which
leaves the former in a broken state for the moment.

In addition, LOG_TAG is moved to Global, replacing per-class LOG_TAGs.
Category filtering in MapView part II (work in progress)

Move filter accessors and FilterDialog to Global.java.  Compiles and runs, but
changes to filter mask are not yet taken into account.