make template updating without restart work

apparently debug(True) never really worked,
we needed the explicit debug=True argument.
now it doesn't cache templates so when you change the file
the change will be immediately visible :)
address causes of multiple proto1 metrics yielding the same proto2
fix collectd plugin

the old one produced proto2 metrics that weren't really good..
this requires setting target_type in the configure_target step
configurable collectd prefix fix #55