TurKit runs lapping each other

[GoogleCodeExporter]

If one TurKit run starts before another finishes, bad things happen. Mostly 
this is OK except for making C# deal with lots of extra messages. The bad 
behavior comes about when this happens:
- One paragraph has finished find-fix-verify
- Another paragraph is still working on some stage

TurKit runs and sends the complete data for the first paragraph. It then shuts 
down. C# ticks off that paragraph as complete. TurKit runs again and sends the 
same complete data. C# marks off another paragraph as complete. It thinks both 
paragraphs are now complete, even though only one is.

Resulting behavior: Shortn shows two copies of the same paragraph.

Possible fixes:
1) put status messages in once() clauses so that they don't get sent so often. 
This is probably a good long-term solution. Allow C# to call TurKit with 
another flag to request the messages get sent again outside a once() clause, 
for example when replaying history on startup.
2) fix the message receiver code so it is more particular about not finishing 
when only one paragraph is done

#2 is faster; #1 is right.

Original issue reported on code.google.com by [email protected] on 8 Sep 2010 at 2:47