finally, SpecMiCP/ReactMiCP can be installed
See issues #32
The cmake files are transformed into a more consistent ensemble.
Install directives are created to allow the installation of SpecMiCP/ReactMiCP
(both the libraries and the include files)
Note : Libraries are now shared by default, static libraries can be build by
turning on the "SPECMICP_BUILD_STATIC" options
TODO : installation of the data files and the examples.