Changeset e1c4636 for keymap.c

* Added owl::send_zwrite(command, message) to the perl glue
         to allow for the direct sending of multi-line messages.
         For example:  owl::send_zwrite("-c foo -i bar", "hello");
* Reverted attempted fix for the pagedown problem
         which just made things worse.
* Changed owl_fmtext_print_plain to return an alloc'd string to
         avoid buffer overrun risks.
* Added owl::ztext_stylestrip("...") function to perlglue
          which returns the ztext with formatting stripped out.
* Added colorztext variable which can be used to disable @color()
          strings arriving in messages after it is set.
          (Currently, changing its value won't reformat messages).
* Outgoing zephyr logging now obeys the logpath variable.
* The '~' character in logpath and classlogpath now gets
          replaced with the user's home directory.