Gbib auto updates

By default the Gbib checks every minute if a flag file on the hgDownload server is more recent than the date of the last update of the Gbib.

If the file on hgDownload is newer, it will start the update:

1. Update the update script itself from hgwdev.soe.ucsc.edu/browserbox and also update the hg.conf from there
2. Update all existing /gbdb files
3. Update all mysql files
4. Update all hgcentral files + patch the blat server table
5. Patch the menu to remove hgNear and add hgMirror
6. Place the symlink to /media from htdocs/folders
7. Run hgMirror to hide some tracks on hg19 and remove some searches from hg19

Note: Will have to move updateBrowser.sh and hg.conf to hgdownload for release.

auto updates can be deactivated with autoUpdateOff and reactivated with autoUpdateOn.