[TxMt] GTD Upgraded

[Mike Mellor]

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Here are the latest changes to the GTD bundle:

Added new location-based contexts:
tw - WORK_TASK
th - HOME_TASK
ew - WORK_EMAIL
eh - HOME_EMAIL
cw - WORK_CALL
ch - HOME_CALL
These new contexts allow users to specify a location for a context,  
in addition to the non-location contexts.

Modifications.
WAIT will now keep the context, as will DONE
Added an unwait command (u) to remove the wait context from a task.

Alaskamike
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