Add TagsAddClassMethods().

As the name implies, this function will convert a normal ctags file to also
have Class::Method() tags so 'ta: Class::Method' finds the method within a
class.  Useful when polymorphism creates several Method() methods in various
classes derived from a common base.
Add ToggleBoolean().
Starting my man.
thoughts
More thoughts.
Cleanup if man produces lines with xxx.
Remove unused DoTestWin().
Have GotoWin() actually check passed in type.
Fix issue if MANPAGER environment variable set.

Removed failed attempt at using vim's internal more.
Convoert s: to <SID> on one call.
More efficient to just call ManLaunch.
Get rid of annoying beeps that occur in some situations.
First pass at getting popping tag stack working.
Use MANWIDTH to format page for the window.