execv doesn't search the path for binaries, making it harder to execute
commands. execvp can be used instead.

Make single-delim-character split() use the string-delims version since
I'm too lazy to fix it separately.

Use standard tools to deal with compile/headers and so on. Autotools are
not necessary easy to use, but everyone knows how to interact with them.

This commit is incomplete:
 - make check doesn't work right now
 - config.h is not used/configured properly

Jsonxx is an import of a third party code, with its own license. While
the licenses are compatible, moving that code to its own directory make
it easier to identify it as foreign.

This commit also remove the extra copy of the code that was in the
repository, and update the relevant Makefile rules.

README moved to markdown, includes project name, description,
instructions, requirements, and links to papers.

Judicael's code, unchanged, extracted from the master branch of pre-ECP
NodeOS repository.

This is not a filter-branch, just a cp -r. We are not losing anything
important in the git history, as it was only 3 commits long, without any
details on the history of the code.