Attached is a patch about a2(en|dis)(mod|site|conf) man pages

* make a2disconf.8 a link to a2enconf.8, just like a2dismod.8 and a2dissite.8

* documented -q option

* documented exit codes

* added "see also" between a2(en|dis)mod.8 and a2(en|dis)conf.8

* fixed a few typos