Version bump to 1.0

After a long discussion with Christoph Junghans, we decided to use version
numbers instead of dates for versioning freeon. This is the first release of
FreeON with the new versioning scheme, hence, version 1.0.
Added debug option "PrintSP2" to print density matrices in SP2.

For debugging, this option will force SP2 to print the initial and the final
density matrix.