BUG: ABSOLUTE option should evaluate relative paths with respect to CMAKE_CURRENT_SOURCE_DIR.  This addresses bug#2797.

ENH: Improved support for user-configured search paths.  Paths given in the CMAKE_LIBRARY_PATH cmake variable are searched first, then those in the CMAKE_LIBRARY_PATH environment variable, then those listed in the call to the FIND_LIBRARY command and finally those listed in the PATH environment variable.  The support is similar for finding include files with FIND_PATH, but the variable is CMAKE_INCLUDE_PATH.

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