🚀 go-pugleaf

Thanks. `fill' was mismatched in all the *Plex files. Sorry. Fixed 
for next release.

>   I've noticed that a lot of the classes have been sprouting `const's
> left and right.  Good job!  Koenig said that this was one of the
> things that no one tells you, but is almost necessary for good code.
> Someone may want to check the rest of the classes for missing `const's
> (header and code mismatch that is).

Most libg++ classes have been thoroughly const-ified. Occasionally
this creates anomolies in order to be sufficiently conservative.  For
example, you cannot perform s.before("x") for a const String s, since
the resulting SubString might modify s. This is true even if you only
want to read, not change the SubString. There are several other such
cases. 

-Doug