COMP: DOC: use find_program( convert) instead of find_package(ImageMagick)

Documentation/SoftwareGuide/CMakeLists.txt

@@ -81,7 +81,7 @@ ENDIF( BUILD_FIGURES )
 # Find ImageMagick tools
 # This is used to convert image formats
 #
-INCLUDE (${CMAKE_ROOT}/Modules/FindImageMagick.cmake)
+find_program(IMAGEMAGICK_CONVERT_EXECUTABLE convert)
 IF(NOT IMAGEMAGICK_CONVERT_EXECUTABLE)
   MESSAGE(FATAL_ERROR "ImageMagick convert utility was not found. Please pass to advanced mode and provide its full path")
 ENDIF(NOT IMAGEMAGICK_CONVERT_EXECUTABLE)