Merge gbinfo-sync-branch.

Synchronize the GBInfo database table with other Mutalyzer installations
by querying them for recently added entries via a webservice method. For
entries without creation info (e.g. uploaded genbank files), the file itself
is also transferred.

Changes to the mutalyzer database:

    ALTER TABLE GBInfo
        ADD COLUMN created TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
        ADD INDEX created (created);

To setup automatic synchronization, use the crontab example in
extras/cron.d/mutalyzer-cache-sync (replace the path to the binary by
`which mutalyzer-cache-sync`).



git-svn-id: https://humgenprojects.lumc.nl/svn/mutalyzer/branches/refactor-mutalyzer-branch@331 eb6bd6ab-9ccd-42b9-aceb-e2899b4a52f1