FIX: move getWaitingFiles after checking permissions (not incrementing
Attempt counter)
FIX: decrement Attempt counter if all sources are banned
FIX: move getWaitingFiles after checking permission
FIX: check targetSEs before getWaitingFiles for dmTransfer, and
decrement Attempt for banned sources (as it was already incremented);
changed rmTransfer to dmTransfer ;-)
Make checkSEsRSS compatible for checking also ReadAccess
Use checkSEsRSS for checking source SEs
In case the request checksum doesn't match, go back to the FC