TODOs
-----

* if 'grml2usb grml64.iso grml.iso' is invoked there are two identically named boot entries (both "grml")
* support installation of new ISO[s] additionally to already existing grml ISOs on the usb device
  -> add "old"/already existing images automatically to bootloader configuration [thx gebi]
* support installation of "dupes", meaning grml2usb grml_2008.11.iso grml_2009.05.iso
* write bootloader configuration snippets to boot/releases/<release>/{grub.cfg,syslinux.cfg,...}
  -> this could simplify live dramatically especially when supporting "already existing" images [thx gebi]
* support integration of Debian ISOs (like netboot)
* provide simple output being between default and --quiet [thx gebi], like:
  # grml2usb iso1 iso2 /dev/sda1
  installing:
    iso1.... OK
    iso2.... FAIL (error)
  done.
* provide default entry of all installed ISOs on the top of the bootscreen
  - done for isolinux
  - missing in grub
* implement --kernel option to install specific linux26 file
* implement --initrd option to install specific initrd file
* implement --squashfs option to install specific squashfs file
* implement --verify option to check md5sums/sha1sums of files on usb device
* implement --uninstall option to remove all grml2usb files in a clean manner
  -> implement logic for storing information about copied files (register every file in a set())
* implement --create-partition[s] option to generate a default partition setup
* implement --validate option to validate partition schema/layout: is the partition schema ok and the bootable flag set?
* the last line in bootsplash (boot.msg) of syslinux should mention all installed grml flavours
  (attention, the line should NOT become too long :))
* code improvements:
  - use 'with open("...", "w") as f: ... f.write("...")'
  - use class design (like used in https://fedorahosted.org/liveusb-creator/browser/liveusb)
* provide a Windows version (for example via PyQt4)
* provide unit-testing (any ideas for useful/test-able scenarious?)
* provide progress bar when copying files
* provide graphical version; any volunteers? :)
