ENH: Implement version support in the find_package command module mode.  Version numbers provided to the command are converted to variable settings to tell the FindXXX.cmake module what version is requested.  This addresses issue #1645.

  - Use CMAKE_PREFIX_PATH and CMAKE_SYSTEM_PREFIX_PATH among other means
    to locate package configuration files.
  - Create cmFindCommon as base for cmFindBase and cmFindPackageCommand
  - Move common functionality up to cmFindCommon
  - Improve documentation of FIND_* commands.
  - Fix FIND_* commands to not add framework/app paths in wrong place.

STYLE: improved error message for the case that neither FindFoo.cmake nor
FooConfig.cmake were found

Alex

ENH: also process "~" and paths relative to CMAKE_CURRENT_SOURCE_DIR in Foo_DIR

Alex

ENH: remove the watch for the upper case variable name, it breaks the
feature summary, which needs to check for both the upper case and original
case _FOUND variables

Alex

ENH: add global properties for collecting enabled/disabled features during
the cmake run and add macros print_enabled/disabled_features() and
set_feature_info(), so projects can get a nice overview at the end of the
cmake run what has been found and what hasn't
FIND_PACKAGE() automatically adds the packages to these global properties,
except when used with QUIET
Maybe this can also be useful for packagers to find out dependencies of
projects.

Alex

ENH: Added NO_MODULE and COMPONENTS options to improve flexibility of the command.  Re-implemented argument parsing to be simpler and more robust.

ENH: Added creation of XXX_FIND_COMPONENTS list of all components requested with REQUIRED option.  This addresses the feature request in bug#3494.

ENH: Added optional component list to the REQUIRED option of the FIND_PACKAGE command.  This addresses bug#2771.

ENH: big change that includes immediate subdir support, removing the notion of inherited commands, makefiles no longer read in the parent makefiles but instead inherit thier parent makefiles current settings

ENH#696: Adding REQUIRED option to FIND_PACKAGE command.  It will terminate the cmake configure step if the package is not found.

ENH: Implemented QUIET argument propagation to FOO_FIND_QUIETLY setting in FindFOO.cmake module that is found.

ENH: Added QUIET optional argument to block error message when _DIR variable is not set.  Also removed upper-casing of package name.