Correct the run_python_file command + boost 1.50 compatible + win32 compatible

Former version crashed in case of syntax error
(cf test_syntax_error.py)

This crashes for most recent versions of boost

Correct branch and email information.

Improve the interpreter

This unit test shows that after a given number of run
of the same file, the error changes.
Unfortunately, this can not be automatically verified, since
the result is printed in the python error stream, and cannot be
redirected.

Add a method to test the existence of a signal.

Remove test for deprecated function

Reduce the memory consumption in the interpreter.

The goal is to reduce the memory consumption.

forced cmake to consider the 2.* versions of python first

  isPluged -> isPlugged.

[skip ci]

  - add isPlugged and getPlugged methods,
  - add property getter name.

pointed out by OS.