tweak apache instructions
- point out that current instructions are Debian-specific
- move example conf to have a .conf extension, mandated by newer versions of Apache
- remove redundanet instructions from conf, delegating to doc instead
only try to detect initconfdir if we actually want initscripts, and simplify
add the infrastructure needed to install facilitator.cgi in the right place
rename default user to fp-facilitator for consistency with production names elsewhere