ENH: Improved flexibility of command by allowing specificiation of separate input and outputs source lists.  Multiple input source lists are now also allowed.

ENH: Improved dependency generation.  If any cmake.depends is out of date, all of them in the tree are re-generated.  This is necessary in certain cases when CMakeLists.txt files change.

ENH: Added option to IF command to test if a command exists.  Syntax is IF(COMMAND name-of-command).

ENH: Added option to IF command to test if a command exists.  Syntax is IF(COMMAND name-of-command).

BUG: Existing projects have cache entries with the same name as the command they adjust (VTK_WRAP_JAVA in VTK, for example).  Setting the command name as a variable is too dangerous.

ENH: Adding VTK_MAKE_INSTANTIATOR command.  This command will be used by VTK kits to register their classes with vtkInstantiator.

to ON.  This allows constructs in CMakeLists.txt files like:
IF(FOO_COMMAND)
  FOO_COMMAND()
ENDIF(FOO_COMMAND)
This provides the option to add CMake commands for extra functionality
without breaking compatability with earlier versions of CMake.

documentation features of python").

BUG: cmake.depends files of zero size were not being re-written in some cases.  Added a comment output to the top of the file so it will be re-written every time.

     composed of .fl files. The names of the generated .cxx files are
     added internally to the Sources list of the target.

should be ignored.

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.