gzip library

[Tiago Nuno Geralda Dionisio <tngd@...>]

I haven't found such library out there so this is my attempt to provide
some simple access to gzip files.

This is based on the liolib.c file so the usage is similar to a normal
file, but to open a file you call gzip.open instead of io.open.

I placed the works here http://mega.ist.utl.pt/~tngd/lgzip.tar.gz

I find it usefull for me... thought someone else might give it some use
too.


Tiago Dionizio