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Use 'grep' to extract the copyright notice from Copyright.txt instead of
duplicating it in the bootstrap script.

Extract upstream KWSys using the following shell code.

$ sha1=719638e233b560afb0d9a0afdcf23469dc1827fe &&
git archive --prefix=KWSys-snapshot/ $sha1 |
tar x

Provides header files that use preprocessor tests to detect and provide
information about the compiler and its target architecture.  The headers
contain no configuration-time test results and thus may be installed
into an architecture-independent include directory.  This makes them
suitable for use in the public interface of any package.

This converts the CMake 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 CMake copyright to
cover the full development time range.

ENH: SUBDIR_DEPENDS command now does nothing.  The parallel build functionality is now automatic.  Dependencies are setup to force the same build order as a single threaded build, but multiple files in the same directory can be built simultaneously.  Also fixed bug with inheriting CMakeLists.txt files when a directory level is skipped.

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

ENH: Added SUBDIR_DEPENDS command and corresponding support code.  This command allows specification that a set of subdirectories be built before a particular directory.