Severity: minor

Following a discussion with Stefan Monnier on the developer list:

 - In "use Package;" the package name is now captured for fontifying
   as intended

 - The declarators "my" etc. now use font-lock-keyword-face for better
   consistency with other programming modes

 - As a by-catch, now all components of package names like
   "Long::Package::Name" are fontified.  This was a known issue of
   little importance, not yet reported as a bug.

 - A test is included as well.
-- 
Cheers,
haj