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21 fix the event identifier in the EvtSelector

Closes #21

See merge request !28

Resolve "Improve the context menu of the history table"

* Context menu of the history table exposes actions `close` and `split` on top of  the usual one.
* Closes #17

See merge request !25

Update EvtSelector to compute properly is_start (end) with respect to the actve period of a person in a team and domain.

Resolve "Create the plugin_event"

* For `list` and `metric`, filtering conditions can be written using the web2py syntax for database query. Therefore, it can deal with foreign tables
    of the `history` table as well as with the `history.data field`. 
* The `smart_query` is still available but deprecated since it can not handle foreign fields.
* Factorize the application around the `plugin_event`.
* Closes #16 and #19

See merge request !24