Improved Mac OS X Application Packaging.

1.  Set python dependency paths in Application Bundle adhering the Homebrew convention of installing them in prefix/libexec
   2.  Add appdmg configuration to produce an os x disk image for FreeCAD application distribution
   3.  Added a Tools convenience script to produce an archive name from a serialized Version.h file using the convention FreeCAD_{Major Version Number}.{Minor Version Number}-{Git Revision Count}.{Git Short SHA}-{OS}-{Arch}

src/MacAppBundle/CMakeLists.txt

@@ -12,6 +12,33 @@ endif()
 install(CODE "execute_process(COMMAND
     ${CMAKE_COMMAND} -E copy_directory ${PYTHON_DIR} ${CMAKE_INSTALL_LIBDIR}/${PYTHON_DIR_BASENAME}
 )")
+
+if(HOMEBREW_PREFIX)
+    #Homebrew installs python dependencies to a site dir in prefix/libexec
+    #and installs a .pth file containing its path to the HOMEBREW_PREFIX site dir.
+
+    file(GLOB HOMEBREW_PTH_FILES "${PYTHON_DIR}/site-packages/homebrew*.pth")
+
+    foreach(PTH_FILE ${HOMEBREW_PTH_FILES})
+        file(READ ${PTH_FILE} ADDITIONAL_DIR)
+
+	string(STRIP ${ADDITIONAL_DIR} ADDITIONAL_DIR)
+        string(REGEX REPLACE "^${HOMEBREW_PREFIX}/Cellar/([A-Za-z0-9_]+).*$" "\\1" LIB_NAME ${ADDITIONAL_DIR})
+        string(REGEX REPLACE ".*libexec(.*)/site-packages" "libexec/${LIB_NAME}\\1" NEW_SITE_DIR ${ADDITIONAL_DIR})
+
+        install(DIRECTORY ${ADDITIONAL_DIR} DESTINATION ${CMAKE_INSTALL_PREFIX}/${NEW_SITE_DIR})
+
+        #update the paths of the .pth files copied into the bundle
+        get_filename_component(PTH_FILENAME ${PTH_FILE} NAME)
+        install(CODE
+            "file(WRITE
+                 ${CMAKE_INSTALL_LIBDIR}/${PYTHON_DIR_BASENAME}/site-packages/${PTH_FILENAME}
+		 \"../../../${NEW_SITE_DIR}/site-packages\"
+            )"
+        )
+    endforeach(PTH_FILE)
+endif()
+
 install(DIRECTORY ${QT_PLUGINS_DIR}/ DESTINATION ${CMAKE_INSTALL_LIBDIR}/qtplugins)
 
 #files installed by homebrew do not have write permission for regular user

src/MacAppBundle/DiskImage/layout.json

@@ -0,0 +1,20 @@
+{
+
+  "title": "FreeCAD",
+
+  "icon": "../FreeCAD.app/Contents/Resources/freecad.icns",
+
+  "icon-size": 80,
+
+  "background": "background.png",
+
+  "contents": [
+
+    { "x": 250, "y": 150, "type": "file", "path": "/usr/local/FreeCAD.app" },
+    { "x": 475, "y": 150, "type": "link", "path": "/Applications" }
+
+  ],
+
+  "format": "UDZO"
+}
+