MHL
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-* remove naming hack in mhlsbr.c for adios and done.
* add ability to filter parts of the message by calling
an external filtering program.
* fix internal pager for mhl?
* Maybe should move etcpath to sbr and add to libmh.
* collect winsize, struct termio, etc... together into a ttyinfo
structure.
-* change adios to take exit code argument.
* use wait3 if not waitpid (maybe)
* some of the calls to setjmp/longjmp should be replaced with
sigsetjmp/siglongjmp.