Release 0.9.6

Major feature enhancements. Added features include stand-alone executable support, R7RS-large Red Edition support (partially), numerous new srfi support, etc.

Download *.tgz file to build from source without previous version of Gauche. It includes pre-generated files that require working Gauche to make.

Release notes: https://practical-scheme.net/gauche/gmemo/?Release%200.9.6

Documents: https://practical-scheme.net/gauche/memo.html