#19796 strip leading underscores from the filname in download url

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs/naaya.content.bfile@21170 a0171fae-0946-0410-966d-b1775066cd26
released 1.4.5, new version 1.4.6

git-svn-id: https://svn.eionet.europa.eu/repositories/Naaya/trunk/eggs/naaya.content.bfile@21171 a0171fae-0946-0410-966d-b1775066cd26