Libraries shouldn't expose global state to users.

This patch makes the Zone interface functional over Loader.db and hides the definition of parserstate.
Remove extraneous whites' space\!
Rename Zone.load_zone to Zone.load and update CHANGES

while I'm breaking the interface of load_zone, I might as well simplify the name
Merge pull request #3 from dsheets/wto99

Antiglobalization of State!