[SA-exim] feature request? change default sa-exim.conf location

[jvanasco at mastersofbranding.com]

I dunno if this is even possible - but what do you (marc) think of 
instead of the current default, throwing it into the same directory as 
the exim configuration file

(though i don't even know if it would even be possible to do that)

right now, its defaulting to /etc/exim4/sa-exim.conf
but exim defaults to /usr/exim/configure

it would be neat  is sa-exim automagically did {directory that exim's 
configure file is in}/sa-exim.conf -- instead of modding it by hand

just an idea though