FORGE-332, FORGE-331: tickets may now be subtasks of other tickets

Custom fields that are 'sum's are now handled specially. They are
coerced to be floats and in super-tickets are the sum of the values in
the sub-tickets.

Subtasks and the supertask, if any, are now listed in the sidebar as
well as "Create New Subtask".

Wolf Wolf 2010-03-02

changed ForgeTracker/forgetracker/model/ticket.py
changed ForgeTracker/forgetracker/static/Tickets/js/custom-fields.js
changed ForgeTracker/forgetracker/templates/new_ticket.html
changed ForgeTracker/forgetracker/tests/functional/test_root.py
changed ForgeTracker/forgetracker/tracker_main.py
ForgeTracker/forgetracker/model/ticket.py Diff Switch to side-by-side view
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ForgeTracker/forgetracker/static/Tickets/js/custom-fields.js Diff Switch to side-by-side view
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ForgeTracker/forgetracker/templates/new_ticket.html Diff Switch to side-by-side view
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ForgeTracker/forgetracker/tests/functional/test_root.py Diff Switch to side-by-side view
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ForgeTracker/forgetracker/tracker_main.py Diff Switch to side-by-side view
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