Improve document_ics module

Registered by Fabien (Open ERP)

Improve the document_ics module. More infos on this module here: http://fptiny.blogspot.com/2008/11/open-erp-50-crm-focus.html

Things to improve:
* if the OpenERP field selected for dtend is an integer or a float (instead of a date), write dtstart+duration when generating the ics for dtend. Same for parsing .ics files.
* add a configuration wizard that asks crm.case.section to be synchronized, it creates one calendar ICS per section. The domain uses this section.

Blueprint information

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Not started
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Priority:
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Direction:
Needs approval
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Definition:
New
Series goal:
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Implementation:
Unknown
Milestone target:
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