Add the root path of the services to python path, not services/.

Get rid of the now useless env.get_services_dir

sugar/__installed__.py.in

@@ -1,4 +1,3 @@
 sugar_source_dir = None
 sugar_data_dir = '@prefix@/share/sugar'
-sugar_services_dir = '@prefix@/share/sugar/services'
 sugar_shell_bin_dir = '@prefix@/bin'

sugar/env.py

@@ -48,9 +48,6 @@ def get_profile_path():
 def get_data_dir():
     return sugar_data_dir
 
-def get_services_dir():
-    return sugar_services_dir
-
 def get_shell_bin_dir():
     return sugar_shell_bin_dir