some fixes in format()
Merge pull request #6 from groessler/something_to_pull

some fixes in format()
added KNOWN_ISSUES file. fix bug when trying to read null variables in history.c.
some cleaning
Delete .string.c.swp
Merge pull request #9 from trozamon/make

Makefile fixes - Many thanks trozamon!!
fix in file permissions
Makefile bugfix + add uninstall rule