Simplifying public Buxton API

BuxtonSimple is an API that allows users who are new to Buxton or
familiar with vconf to utilize Buxton. There are fewer function
arguments for each function.  This is possibile because there are
default call back functions and a global client provided in
the library. There are also newer functions similar to those found
in the vconf API (such has set_int32). The opening and closing of the
client connection is embedded into each function called so the programmer
does not have to call buxton_open() or buxton_close().

There is a library called libbuxtonsimple that can be linked to by a client
program when using BuxtonSimple (-lbuxtonsimple). This exposes only the
funcitons in the BuxtonSimple API, without the functions from the original
Buxton API.

Man pages for the BuxtonSimple API and all public functinos are included as
well as demo code.

Test units are also included in the /test directory.

Added check_buxtonsimple to .gitignore