Allow programmatic setting of missing modules in sc.loadobj()

[cliffckerr]

Automate this:

sc.loadobj('my_old_pickle.obj', remapping={'fp_data.DHS.calobj.CalObj':fp_utils.calobj.CalObj})

e.g. via

def load(*args, **kwargs):
    ''' Tiny alias to sc.loadobj() to load saved calendar objects '''
    import sys
    import types
    import fp_data
    # First, add any placeholder modules that have been subsequently removed
    fp_data.DHS = types.ModuleType('DHS') 
    fp_data.DHS.calobj = types.ModuleType('calobj') 
    sys.modules['fp_data.DHS'] = fp_data.DHS
    sys.modules['fp_data.DHS.calobj'] = fp_data.DHS.calobj
    fp_data.DHS.calobj.CalObj = CalObj
    cal = sc.loadobj(*args, **kwargs)
    assert isinstance(cal, CalObj)
    return cal

[cliffckerr]

Closed by #174