The DynamicLoader::LibPrefix and DynamicLoader::LibExtension methods
previously hard-coded the module name components for each platform.  Set
them from the CMAKE_SHARED_MODULE_PREFIX and CMAKE_SHARED_MODULE_SUFFIX
CMake variables instead.  This ensures consistency in a program that
uses these methods to construct the file names for its own modules.

This converts the KWSys license to a pure 3-clause OSI-approved BSD
License.  We drop the previous license clause requiring modified
versions to be plainly marked.  We also update the KWSys copyright to
cover the full development time range.

BUG:  FormatMessage can return a NULL message.  Add check for NULL pointer.

COMP: also build the static dummy loader on Cray Catamount

Alex

COMP: add a dynamic loader for systems which don't support dynamic loading, so this is handled in kwsys and not every project using this has to care for it

Alex

BUG: revert yesterday patch. The implementation was correct. The problem was that _WIN32 was forced to be #define on cygwin when included from ITK, which was miss matching the implementation from the declaration. Put extra condition for CYGWIN system

BUG: Make sure to use the Win32 interface (HINSTANCE) for handling shared lib on cygwin and mingw system

BUG: Fix problem with loading dylib on Tiger (10.4) x86. We need to be using the dlopen/dlclose instead of the old NSModule

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

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

BUG: Including file within a namespace{} is dangerous(unless symbols are within an extern C). Also update documentation about special case for MacOSX

ENH: Adding kwsys implementation for a DynamicLoader class. Copy from itkDynamicLoader, with patch from cmDynamicLoader