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

moved managed record/entity handling to the UnitOfWork. identity maps are the next. started to remove obsolete table stuff.

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.

Added tests for Doctrine_Access. It uses annotations for exceptions and to mark functions as tests. Also changed some logic in access and implementing classes to make the abstraction a little bit more solid

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

fixes #696 function was named synchronizeWithArray but i renamed it to synchronizeFromArray because it makes more sense because all the other mades user the term "from"

reverting the reorganization done in 3455-3456 in order to make merging my experimental branch to trunk easier.

Preparation for new organization of code in to sub packages. Changed autoload() to work with new structure.

Changed the link() method's use of getLocal() and getForeign() to getLocalFieldName() and getForeignFieldName().

Added link() functionality to create links between related records. It basically works in the opposite way as unlink().

The unset functionality is not working for foreignKey relations

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.

Be carefull when using it as it loads related records.
But can be really convenient, specially when loading data from the
_GET and _POST variables (possibly from a form)