Change code that creates a ZMap to use new ZMap calls that do this.
Add code to load data into a zmap and also to reset one, the latter
operation is unfinished.

Sort out the killing of GUI and threads so they are correct for a ZMap
to kill itself.
Add new states to ZMap so we can better control interaction with user and
with threads.
Each Zmap can now run multiple threads to contact multiple servers.
Make cleanup code more robust by using state of Zmap and state of threads.

Update routines to stringify request/raply enums.