Change documents markup to improve readability and extend content to fit
the new installation process.
INSTALL*, README and LICENSE documents have been moved/renamed in order
to be found at the root directory to conform with open-source project
standards and let people easily find these files once they retrieve
either a distribution tarball or a clone of git repository.
README.txt in init dir has been deleted as INSTALL.txt in root directory
now integrates its content.
INSTALL.txt and example.txt are now installed in 'docdir' at 'make
install' time.