CPackWiX: adhere to CMake member naming convention
Refine content regarding package configuration files.

Add some more content from

 http://www.cmake.org/Wiki/CMake/Tutorials/Packaging#Package_Configuration_Files

Add uniformity to references to package configuration files.
Merge topic 'cmake-packages-manual' into next

35e9a2c Refine content regarding package configuration files.
Merge topic 'wix-cmake-coding-conventions' into next

37a1157 CPackWiX: adhere to CMake member naming convention