Update .gitignore
doc: change RequirePackage -> LoadPackage
doc: build documentation using AutoDoc
Add GPL license file

Last year I talked to Werner about this, and he explicitly
agreed to nq being licensed under the GPL.
build: switch to m4/ac_find_gap.m4
remove CVS leftovers
doc: update TODO
build: use VERSION in configure.ac
build: add autogen.sh
PackageInfo.g: update URLs
build: remove doc/Makefile.in, update 'clean' & 'distclean' targets
build: remove files generated by autotools
build: switch to automake
Reformat CHANGES file to be closer to MarkDown syntax
build: keep supporting --with-gap-root
Link to issue tracker
doc: change indention
src: fix some warnings
doc: update install instructions in manual
build: assume all doc/*.xml files belong to manual