Comment-only changes to hopefully make gen_make.py more easily understandable.
Comment-only changes to hopefully make gen_make.py more easily understandable.

* build/generator/gen_make.py (write): Comment additions and corrections,
    including section headers dividing this very large method into chunks,
    each writing just one kind of output to build-outputs.mk.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion