Replace hard-coded shebang paths with appropriate autoconf variables
There are still some shebangs left unsubstituted:
> ack -li /usr
configure
lib/simbuto/python/simbuto/manager.py.in
lib/simbuto/python/simbuto/utils.py
lib/simbuto/python/simbuto/signalmanager.py
lib/simbuto/python/simbuto/config.py.in
lib/simbuto/r/simbuto-functions.R
Makefile.in
debian/copyright
debian/rules
debian/prerm
bin/simbuto.in