Refer users to the newer CMAKE_<LANG>_COMPILER_VERSION variables.
Use a more concise summary. Format the documentation to look
better in the "cmake --help-module" output.
Patch from Aaron C. Meadows
Adds support for detecting VS 2010 SP1
Also improves performance using CMAKE_CXX_COMPILER if it is available
and for robustness falls back using try_compile() and try_run()
This adds copyright/license notification blocks CMake's non-find
modules. Most of the modules had no notices at all. Some had notices
referring to the BSD license already. This commit normalizes existing
notices and adds missing notices.