Much improved and quicker highlighting using font-lock.
Support for hilit19 removed.
Support for imenu added.
Changed indentation for continue statements.
Added treatment of preprocessor directives.
(f90-directive-comment-re) is now a regular expression.
Many bug fixes.
(f90-font-lock-keywords-1): Type may now have attributes private
and public.
(f90-font-lock-keywords-2): Fixed difference between type and type().
(hilit-set-mode-patterns): Type may now have attributes private.
and public, fixed difference between type and type().
(f90-p-type-re): New regular-expression constant for type commands.
(f90-mode): indent-tabs-mode put to nil by default.
(f90-looking-at-type-like): Now uses f90-p-type-re.
(f90-no-block-limit): Now uses f90-p-type-re.
(f90-change-keywords): Don't change preprocessor lines.
