Initial work by Emilien Lemaire <emilien.lemaire@ocamlpro.com>

Additional features:
* Do not check for enter/exit section: instead, sum time from paragraphs
* Support for modules, CALL and ENTRY points
* Support for recursive calls
* Allocate virtual stack on demand instead of statically
* Correct handling of EXIT PARAGRAPH code with 'goto'
* Prevent CANCEL from dlclose a module during profiling
* Customize CSV result file with COB_PROF_FORMAT
* Customize CSV filename using $b/$f/$d/$t
* Add some tests for RECURSIVE on PROGRAM-ID

* fix compile under WIN32 and systems without CLOCK_MONOTONIC / CLOCK_MONOTONIC_RAW
* fix use of defined but unavailable CLOCK_MONOTONIC_RAW
* minor refactoring