ENH: Enabling ability for CMAKE_MINIMUM_REQUIRED version to include patch level.  Submitted by Alexander Neundorf.

ENH: Added reference to Copyright.txt.  Removed old reference to ITK copyright.  Changed program name to CMake instead of Insight in source file header.  Also removed tabs.

ENH: Renamed cmStringStream to cmOStringStream and added cmIStringStream.  Removed cmInputStringStream.

ENH: Added cmStringStream class to wrap std::stringstream or std::strstream depending on the platform.  The interface is that of std::stringstream, so no "ends" or "rdbuf()->freeze(0)" lines are needed.

ENH: change InitialPass to take a const reference to the argument string, to avoid changes to the file cache

ENH: Moved cache entry addition into cmMakefile::AddLibrary and AddExecutable so that commands do not have to add it explicitly.

ENH: Added SOURCE_GROUP command and corresponding support code.  This command allows CMakeLists files to specify how sources are organized into groups in the generated DSP files and makefiles.

ENH: Added INCLUDE_REGULAR_EXPRESSION command to set regular expression used in dependency checking.