Converted timezones to new format.
Merge branch 'master' into new-parser
Moved to new format.
Removed pluses.
Further timezone format tweaking, to suit xprintf fiddliness.
Using new time zones. Update TZ offset dynamically on DST change.
Merge branch 'master' into new-parser

Conflicts:
	common/config.h
Clean up last of merge.
Moved code around for cleanliness.
watchface parses new TZ format
First pass at storing a string cookie.
Initial version of tester app.
Switch to using builtin snprintf instead of xprint.
Start parsing TZ flag.
Update watchface to use new storage format.
Removed unused header file.
Bumped version number.