Rewriting kernel toolchain
Enabled VFAT support.

Fixes #13, ie. user can now use Rufus to write ISO images to USB stick.
Updated kernel preparation tool
Misc bugfixes.

Including:
 - fixed invalid paths
 - set -e => stop on error
 - if kernel sources already extracted, backup old directory & extract downloaded
Unzipping made quietly
Ignore AUFS sources
Configure XFCE on login.
Begin creating Makefile-based tools for kernel.
Added PaX flags for Iceweasel (Firefox) and Ghemical
Added VLC, removed chemtool, TeXmacs, octave.
Fixed bugs in configure-xfce: added types, required when creating new values.
Fixed bug: should remove paxctl without user interaction.
Added translation for web access -link
Added GeoGebra to digabi-apps package.

License allows "non-commercial" distribution. (Copy of the license in geogebra-license.txt, will be installed in /usr/share/digabi/geogebra-license.txt.)

GeoGebra package has been added to Digabi APT repository, non-free section.
More grsecurity restrictions & logging.
Enable building sources, fixed syntax.
Fixed syntax, added parameter to enable security (which is already enabled by default).
Disable creating source archives: not needed always.
Added Digabi bird logo, use it in menu.
Install non-free firmware, if non-free repositories have been enabled.