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merge conflicts resolved
FIX: getting active replicas from Replica Manager

then, there is no need for further checks on the SE status
save
save
save
save
NEW: RSSCache without refresh thread
FIX: meta tags
Fix the fact that the getMetadataFields now returns a dict with
FileMetadataFields and DirectoryMetadataFields 
Catch the case someone puts a meta tag that's at file level as there is
no support for getCompatibleMetadata at file level yet
NEW: backup
FIX: set configurable email address on the CS to send the RSS emails
NEW: RSSCache with no thread in background