cmake: fixed install location for share data

* samples, apidoc and misc go now to into PREFIX/share/icnc
* don't mark bat files executable on non-Windows installs
cmake: install libs with SOVERSION
Merge pull request #25 from ottxor/master

cmake install fixes
cmake: added SONUMBER to mpi libs, too
Merge pull request #26 from ottxor/master

cmake: added SONUMBER to mpi libs, too