Release notes for 1.27

Biggest news:
 * A new C++ check was added that detects non-virtual destructors of base classes.
 * Command line changed. 
 ** --recursive is no longer available. 
 ** --errorsonly was renamed to --quiet.
 ** --force was added
 ** Short versions -a, -q, -s, -v, -f created. 
 * This version is more accurate than previous versions