generate less conflict error while posting new results to active_process, like this it is possible to do computation with many nodes and store results inside only one active process

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- add PropertySheets required for new bt erp5_payroll


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- add classes required for the new bt erp5_payroll


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Fixed testPreferences test. General review of tales expressions and definition of results through tests is required.

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use re.search instead of re.match for run_only parameter. the more strict "match" is not really required here.

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Removed per portal type filtering (yet keep compatibility with existing methods). Added a cache key so that filter expression results can be cached (ex. per portal_type). The general idea is that nearly nobody uses portal type filtering and that increasing the number of SQL methods tends to decrease performance.  By caching expression results, the impact of additional SQL methods is less significant. 
In addition, code syntax has been improved here and there (spaces, tabs). Some comments were added. Hardcoded values removed.

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Restore previous BaseTradeProject_FieldLibrary in order to keep compatibility with not yet fixed proxy fields.

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Add preference for saving user's preferred timezone.
(Note: this requirers installing "pytz":http://pytz.sourceforge.net/ on your machines) 


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Added extra verification and parameters so that editable fields which are rendered in listboxes and which use the cell parameter in TALES expression do not generate useless errors anylonger.

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Add to reports the possiblity to invoke a method on the report context in order to find the object on which the form should be applied to. This is used by the new documentation system to build DocumentationHelper instances (which do not exist within the ZODB) for each URI of each report section.

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