Second parameter support in Doctrine_Pager::setCountQuery and added new method: Doctrine_Pager::getResultsInPage(), which returns the numbers of itens in current page

Added different counter query support for Doctrine_Pager. Now it can use 2 different queries to paginate items. Added 4 new methods: setCountQuery, getCountQuery, setCountQueryParams and getCountQueryParams. If not defined a counter Doctrine_Query, the collector one is used. If no params were defined to be used in counter query, the ones passed by execute method are used

Fixed count bug in Doctrine_Pager that was wrong counting the total of results found. Added 3 new methods: Doctrine_Pager::getExecuted (checks if the Pager was already executed), Doctrine_Pager_Layout::execute (handy access to execute Pager query without having to access Doctrine_Pager instance) and Doctrine_Pager_Layout::processPage (processes the template of a given page and returns the parsed string)

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.

ADD: Added methods: addMaskReplacement, removeMaskReplacement and cleanMaskReplacements in Doctrine_Pager_Layout. They are responsable to make masks behavior as another masks or values on predefined situations.

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