Update rich text editor. Fixes #407.
Rich text editor can now handle variables in hash tables.
Make a copy of the SlimTableFactory for every test system.

Otherwise data collected by a run (such as defined table types) can be exposed to a next run.
No need to start a FitNesse server when command is provided on the command line.
Import tests can not depend on FitNesse server running.
Clean up now unused pages.