"GString" vs. "gstring".

[dwheeler ida org (David Wheeler)]

The type names of "gstring" and "GString" are, uhm, rather similar :-).
This seems confusing; it certainly makes them harder to talk about.

I'd like to see one of these type names changed so that their names
differ by more than case.  Aliases could be created for the original
names of types & functions, so no code would need to break.
The "old" name could be deprecated & removed several years hence.

Here are a few ideas; probably someone will have a better one:
* "gstring"->"gstr" or "g_str".  This would be consistent with the
  names of the functions dealing with them.
* "GString" -> "GVString" (Variable-length string).