more cmake changes to avoid cmake warnings

tools/htmlify/CMakeLists.txt

@@ -3,7 +3,7 @@
 # information about it at http://www.cmake.org
 #
 
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.8.4)
 
 # create a variable called target_name and set it to the string "htmlify"
 set (target_name htmlify)

tools/imglab/CMakeLists.txt

@@ -3,7 +3,7 @@
 # information about it at http://www.cmake.org
 #
 
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.8.4)
 
 # create a variable called target_name and set it to the string "imglab"
 set (target_name imglab)

tools/mltool/CMakeLists.txt

@@ -3,8 +3,7 @@
 # information about it at http://www.cmake.org
 #
 
-#SET(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 2.8.4)
 
 # create a variable called target_name and set it to the string "mltool"
 set (target_name mltool)

tools/python/CMakeLists.txt

 
-CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
+CMAKE_MINIMUM_REQUIRED(VERSION 2.8.4)
+
 
 # Uncomment this to make a Python 3 compatible library instead of a Python 2
 # library.