Moved the traitlets based config to sandbox (created it).

Stefan's prototype new config system that is based on ideas from
traits, depended on Python 2.5.  We have not done a thorough code
review of this code and I don't think we are even using it yet.

I have moved all the code from IPython.config to the top-level
sandbox.  I have begun to remove all references to these modules
(just a few imports), but I still need to do lots of testing
to make sure there are no lurking problems.

IPython/config/api.py

@@ -1,106 +1,102 b''
 # encoding: utf-8
 
 """This is the official entry point to IPython's configuration system.  """
 
 __docformat__ = "restructuredtext en"
 
 #-------------------------------------------------------------------------------
 #  Copyright (C) 2008  The IPython Development Team
 #
 #  Distributed under the terms of the BSD License.  The full license is in
 #  the file COPYING, distributed as part of this software.
 #-------------------------------------------------------------------------------
 
 #-------------------------------------------------------------------------------
 # Imports
 #-------------------------------------------------------------------------------
 
 import os
 from os.path import join as pjoin
 
 from IPython.genutils import get_home_dir, get_ipython_dir
 from IPython.external.configobj import ConfigObj
 
-# Traitlets config imports
-# from IPython.config import traitlets
-# from IPython.config.config import *
-# from traitlets import *
 
 class ConfigObjManager(object):
     
     def __init__(self, configObj, filename):
         self.current = configObj
         self.current.indent_type = '    '
         self.filename = filename
         # self.write_default_config_file()
         
     def get_config_obj(self):
         return self.current
     
     def update_config_obj(self, newConfig):
         self.current.merge(newConfig)
         
     def update_config_obj_from_file(self, filename):
         newConfig = ConfigObj(filename, file_error=False)
         self.current.merge(newConfig)
         
     def update_config_obj_from_default_file(self, ipythondir=None):
         fname = self.resolve_file_path(self.filename, ipythondir)
         self.update_config_obj_from_file(fname)
 
     def write_config_obj_to_file(self, filename):
         f = open(filename, 'w')
         self.current.write(f)
         f.close()
 
     def write_default_config_file(self):
         ipdir = get_ipython_dir()
         fname = pjoin(ipdir, self.filename)
         if not os.path.isfile(fname):
             print "Writing the configuration file to: " + fname
             self.write_config_obj_to_file(fname)
     
     def _import(self, key):
         package = '.'.join(key.split('.')[0:-1])
         obj = key.split('.')[-1]
         execString = 'from %s import %s' % (package, obj)
         exec execString
         exec 'temp = %s' % obj 
         return temp
 
     def resolve_file_path(self, filename, ipythondir = None):
         """Resolve filenames into absolute paths.
 
         This function looks in the following directories in order:
 
         1.  In the current working directory or by absolute path with ~ expanded
         2.  In ipythondir if that is set
         3.  In the IPYTHONDIR environment variable if it exists
         4.  In the ~/.ipython directory
 
         Note: The IPYTHONDIR is also used by the trunk version of IPython so
                changing it will also affect it was well.
         """
 
         # In cwd or by absolute path with ~ expanded
         trythis = os.path.expanduser(filename)
         if os.path.isfile(trythis):
             return trythis
 
         # In ipythondir if it is set
         if ipythondir is not None:
             trythis = pjoin(ipythondir, filename)
             if os.path.isfile(trythis):
                 return trythis        
 
         trythis = pjoin(get_ipython_dir(), filename)
         if os.path.isfile(trythis):
             return trythis
 
         return None