Log Message:
Add -F for "fetch" output, so that you can pre-fetch all the distfiles
you need and then build off-line (suggested by smb).

Add -M to set the name/location of the make program (for the -F and -R
output formats) to be used on systems where the make program is not
the one you want (suggested by seb).

Clean up a bug with subgraph assignment and counting.

Move to 2.3.