Integrate MRPT with MATLAB (mex files)

[jlblancoc]

@jesusbriales @jlblancoc Please, add here new tasks as we think of them, so they don't get lost! (Just click on the check to mark/unmark them when done. See also https://github.com/jlblancoc/mrpt/milestones )

List of pending tasks in this line:

• Update mexplus embedded copy from upstream.
• Create #define macros to help automating the serialization to mxArray format (Is it worth?)
• Create a doxygen page (in doc/doxygen-pages) mentioning all provided mex scripts. (Should we document them there, in doxygen? I think it's a good option...)
• Think & test where compiled .mex* files should go after install, thinking of Windows package installers (Program Files/MRPT/bin, Program Files/MRPT/mex,..??)
• Place #define macros related to MEX methods in a more appropiate header? (Currently added to CSerializable.h)
  Finally:
• Merge branch new-mex-lib

[jlblancoc]

@jesusbriales I just updated this to block mrpt 1.3.2, so we can release 1.3.1 sooner, ok? ;-)

[jbriales]

Ok! :)