[Tracker] removable media support

[Tshepang Lekhonkhobe <tshepang gmail com>]

ff. is in TODO. Should it be removed, as in is all things mentioned
already implemented?

1. HAL integration into Tracker

    * We need to be able to handle files in removable media
    * Database already includes support for removable volumes and all file
      services have an enable flag which can be used for this
    * Needs to be able to auto-index files when a usb drive is plugged in
    * Needs to be able to update URIs for all affected files when a usb drive
      is mounted (paths of a previously indexed mount might be different when
      remounted)
    * Need to be able to hide files and exclude from search when a usb drive is
      unmounted

-- 
my place on the web:
floss-and-misc.blogspot.com