Move away from enable/disable command line flags, use --name=BOOL.

Fixes #73.
Change documentation strings of default features.

To cope with the new specification scheme.
Switch to true/false booleans in Makefile.

Rather than 0/1. To be consistent with command line option spec.
Merge branch 'master' of github.com:samoht/assemblage into no-camlp4

Conflicts:
	bootstrap.sh