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Self-explanatory.

We used to pass the environment for the user job implicitly, as the
environment of argo_nodeos_config.  This wasn't very clean and was
causing problems with, e.g., LD_PRELOAD, which gets filtered out because
argo_nodeos_config is suid root.  So now we pass the environment as a
required, explicit argument.

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

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

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.