Large dictionary fix for updates and accuracy

Fairly extensive updates to the dictionaries to:
- update some frequently covered countries for leadership changes in the last few years
- improve actor accuracy by tweaking actor and agent files
- reduce miscodings (specifically 190s) by changing the verb file.
- dramatically ramp up the ruthlessness of the discard list

I'd like to do a few more hours of testing tomorrow (Friday) before merging this to master. And I'd also love anyone else's thoughts (@johnb30 or @philip-schrodt ?) before we start the re-coding with these.