* Add instruction on how to install the debian packages
 * Update version to 0.4.1
 * Add a small comment about the diskdump format

Update the documentation to reflect the changes made after 0.2.4

 * Add instuctions for installing the software in Ubuntu 12.10
 * Rephrase some parts in install, overview and usage sections

Make them comply with current source tree

Add missing sections

Add a part explaining the usage and input options of the
non-interactive version of snf-image-creator.