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

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

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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.
chipx86
  1. This looks great. I'll commit this and your other change and bump the version to 0.7.
    
    Thanks!
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chipx86
  1. Committed in r1257. Thanks again! Excellent work on these patches.
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