This is an initial take at renaming the project to Monitoring Plugins.
It's not expected to be fully complete, and it is expected to break
things (The perl module for instance). More testing will be required
before this goes mainline.
Some commands need the environment to function properly. One such
example is check_ssh and check_by_ssh when a SOCKS proxy is required.
This patch use setenv and extern char **environ to alter and pass the
new environment to the child process Those modules have been added to
Gnulib for portability.
