Merged all identity maps into one in the unitofwork. identity map now properly works with hierarchies.

Refactorings along with a speed improvement on the Hydrator when processing joined resultsets. Other minor tweaks.

refactorings, a bug fix (#786) and improved performance for the hydration of results from polymorphic queries.

made sure every caller of getIdentifier can handle an array. getIdentifier now always returns an array.

started refactoring to final mapper structure for 1.0. different mapping strategies are factored out as separate strategy classes instead of inheritance.

Merged r3518:r3700 from branch to trunk. Branch to be deleted, soon. Development continues in trunk.

The default is set to false because fetching the relations deletes
previously fetched relations =P. This is, if you fetched an aggregated
value (SUM, COUNT), it wont be refreshed, it will be overwritten by the
actual related values.

The bug does appear if you clean the identityMap from the Group table before querying the DB

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renamed Doctrine_Record::obtainIdentifier() to Doctrine_Record::identifier(), fixed identityMap implementation

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Ticket: 192

Major change on how transactions are being handled: insert / update queries are now executed immediately and only deletes are being gathered (due to delete optimization strategies). Fixes #138, #135