* clsql-mysql.asd: Renamed uffi/mysql interface library from
mysql to uffi_mysql
* db-mysql/uffi_mysql.c: Renamed from mysql.c
* db-mysql/Makefile, db-mysql/mysql-loader.lisp: Rename shared library
* db-*/*-loader.lisp: Commit big patch from Edi Weitz to remove
absolute pathnames when searching for foreign libraries.
* uffi/clsql-uffi-loader: New file from Edi Weitz for support
foreign library loading.