[Python-Dev] Change in priority fields

[Brett Cannon]

Barry, Neal, and myself had a conversation and changed the priority
fields in the tracker. You can click on 'priority' to see an
explanation, but the new fields are:

- release blocker
- critical
- high
- normal
- low

So "release blocker" blocks a release. "Critical" could very easily
block a release, but not the current one. "High" issues should be
addressed, but won't block anything. "Normal" is normal. And "low" is
for spelling errors and such.

-Brett