Add configuration variables to the top of post-review for site-wide defaults

Review Request #335 — Created March 31, 2008 and submitted


Review Board SVN (deprecated)


This adds a set of configuration variables to the top of post-review, one for each of the command-line switches where it would make sense, so that sites can easily set site-wide defaults.  

I also made the command-line option definitions more consistent, and added '-n' as a short flag for the '--output-diff' option (since '-n' usually means "tell me what you're going to do without actually doing it," which seems appropriate here and is how I use that option).

Finally, I updated the usage string.
I've done basic sanity-checking on each of the configuration variables.
  1. This looks great. I'll commit this and your other change and bump the version to 0.7.
  1. Committed in r1257. Thanks again! Excellent work on these patches.