Update xdg-open

If chromium is Installed in FreeBSD, the binary name is 'chrome'
Final version of 10.0 Handbook
Merge pull request #16 from mike-pt/master

Update xdg-open to recognize the "chrome" binary.
Auto-Commit of i18n data from Pootle
Auto-Commit of i18n desktop tags from Pootle
Sync with ports tree
Add the PCDM_SESSION variable detection to xdg-open for detecting the running DE
Add PCDM_SESSION variable passthrough in sudoers
Merge branch 'master' of github.com:pcbsd/pcbsd
Adjust the mount tray unmounting routine to first unmount any additional nullfs mounts of the original mountpoint before unmounting the mountpoint. This still needs testing on 10.0 (since 10.x PBI's do the additional nullfs mounts).