verbose mode to output runtime status of makeflow.

Useful for large workflows which may cause Makeflow to appear unresponsive.
Allow comments inside a rule
work_queue master keeps counter of gpu availability per worker
Merge branch 'makeflow_comment_fix'

Allow comments inside a rule.
Merge branch 'makeflow_verbose' of git://github.com/rampantmonkey/cctools into rampantmonkey-makeflow_verbose

Useful for large workflows which may cause Makeflow to appear unresponsive.
Merge pull request #278 from rampantmonkey/master_gpu_counter

work_queue master keeps count of the gpu availability and allocation just like the other resources at worker.
remove unnecessary comments and commented out debug messages
use binary ppm encoding instead of ascii.

Cuts the file size in half.
Also allows for larger color range without increasing the file size
remove unnecessary hash_table cleanup.

hash_table_delete already does this.
Merge branch 'rampantmonkey-ppm_encoding'

Switch from PPM ASCII to PPM Binary file format. This uses triplets of chars to
represent the color of each pixel instead of triplets of integers. Consequently
the file size is cut in half.