Removed unused lang from calendar/calendar.js
calendar-base uses its lang, calendar had unused copies of those files
Removed unused `short_weekdays` strings from calendar/lang
Only `weekdays`, `very_short_weekdays` are used
Fixed calendar's calendar-base-manual test
There was a call to a non-existing function,
plus the test's interface was a bit confusing /  misleading
Removed superfluous `weekdays` from calendar/lang
Use `datatype-date-format`'s weekday strings (which even support way more locales)
Merge branch 'calendar-lang' of git://github.com/asystance/yui3 into dev-3.x

Conflicts:
	src/calendar/meta/calendar.json
Build calendar and calendar-base.
Build yui to pick up calendar metadata changes.