Fixed a bug in the parsing: Now the story output works as expected.

-Peter Mawhorter
Added some rules for making events, but the full structure isn't present
so they cause errors. Fixed some bugs with errors only being generated
some of the time (based on rule ordering not being consistent). Still
don't know why errors were sometimes avoided and sometimes not even with
identical rule sets (but different orderings) but at least now things
should be consistent from run to run.

-Peter Mawhorter
Incremental work on basic story moves (getting add_event to work)
including some debugging statements in event.lp.

-Peter Mawhorter