fix to repl prompt issues and history.

[royward]

Changes:

• was experimenting with 'get-type-space' (commented out to come back to later).
• commented out the the set_prolog_flag's for history (don't know if I need to)
• stripped out all the GNU readline stuff
• added code in to create whatever directories are needed to save the history file
• wrote an el_wrap_metta (to use instead of the default el_wrap), do el_unwrap to remove the default before installing my one.
• Changed history to completely use the editline stuff
• Fixed prompt issue (I think it was some extra prints, and maybe interference from the GNU readline).
• Add an newline on Ctrl-D