Remove a lot of warnings (considered as errors by dune).

I've fixed that using memcmp, which should be fine since compared elements
are of the same types.

Reference Manual enhancements.

There were problems with:
- arrays in step functions (array were declared with an incorrect syntax)
- the node_loop.c file was wrong in presence of arrays in I/O
- clock that are outputs (a "*" was missing)

when calling soc.

Do not work all the times (eg, with arrays it generates C code that
does not compile). cf next changes.

The rationale is to prepare the work for a future --2s-stack option.

Add an option --to-c-dont-inline-predef to get the previous behavior.

I've just switched to ocaml 4.02, and it works only on carlit because
of GLIC 2.14 is not installed on other machine.

also, add some missing files.