Added Comments to Header File

TODO: remove internal library functions.
TODO: remove functions that are not used from header and lbuxton-simp.c
Created man pages for get, buxton-simp-api
Added demonstration code to get man page

Cleaned up the test code in lbuxton-simp_test.c, copied it into the
Code Example section in the buxtond_get man page. Added a forgotten
buxtond_get function.
Modified Makefile.am to install new man pages

Added a forgottan get man page. Added new man pages to Makefile.am
TODO: add set man pages to Makefile.am when they are finished
Fixed misspellings
Small corrections to man pages