Big update to improve historical country coverage and political actors

Most of the edits fall into three categories: 

- fixing historical country coverage (e.g. adding in the Soviet Union)

- adding many more variations on political actors names, which should dramatically improve the rates at which they code them. (e.g., not just "John Kerry", but also "Secretary of State John Kerry", "Secretary Kerry", etc.)

- adding national institutions that were only covered by the names of their leaders before. (e.g., "Bundestag" is now in there as DEULEG)

There are assorted corrections and updates from the news and from looking through the generated event data, especially in the verbs file.