ENH: Cleanup DynamicLoader so that the symbols have more consistent names, start using dynamic loader from kwsys in CMake

ENH: fix find program to look for .com and .exe correctly and not return files with no extension on windows

ENH: Add documentation on the problem with system wide path for looking up dynamic libraries. STYLE: Fix trailing white spaces

BUG: Trying to get testDynamicLoader to work on Solaris and SunOS, where current directory is not lookup when doing dlopen

ENH: Make sure that we find the proper symbol and not the one that start with _. STYLE: Remove an old style cast