optional filters by meta_type added to Ajax tree

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs/Naaya@20033 a0171fae-0946-0410-966d-b1775066cd26
released 3.2.31; new version 3.2.32

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs/Naaya@20034 a0171fae-0946-0410-966d-b1775066cd26