Delay

* Delay mounting until tracker is started
* Wait for tracker to actually acquire its dbus names
* Make sure timestamps are correct on mountpoint before and after mounting so tracker doesn't recursively ignore the directory
* Use udev -> systemd device unit activation and bind the mount service to it, to be able to wait for some time without udev getting impatient and killing us
* Send some informative log messages to journal
* remove /media/sdcard from index-recursive-directories setting to avoid double indexing and other bad things
* Set some sane values to other settings