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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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This megapatch changes the way accessors are generated. Instead of generating all accessors for each portal type, we only generate tuples which are put in a kind of tuple cache. The idea is to minimise the number of objects which are created and use objects which are as small as possible. Then, the next time aq_dynamic is invoked, we dynamically create a new accessor instance based on the parameters provided in the tuple. This way, it is possible to reduce the memory footprint of ERP5 by 200 MB at least and create only those accessors which are needed. 
In addition, accessors are now generated per portal_type and per class. This way, if the class of a portal type changes in a system, different accessors are generated and there is no risk of falling into a problem of "first argument of method XXX must be of type YYY".
The downside is currently a possible speed decrease of 2-3%.

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