support legacy gcp model weights

[delgadom]

Support legacy model names in gcp_modelwieghts

model_map = {
    'rcp45': {
        'pattern1': 'surrogate_mri-cgcm3_01',
        'pattern2': 'surrogate_gfdl-esm2g_01',
        'pattern3': 'surrogate_mri-cgcm3_06',
        'pattern4': 'surrogate_gfdl-esm2g_06',  # ok if missing - assigned weight 0
        'pattern5': 'surrogate_mri-cgcm3_11',
        'pattern6': 'surrogate_gfdl-esm2g_11',
        'pattern27': 'surrogate_gfdl-cm3_89',
        'pattern28': 'surrogate_canesm2_89',
        'pattern29': 'surrogate_gfdl-cm3_94',
        'pattern30': 'surrogate_canesm2_94',
        'pattern31': 'surrogate_gfdl-cm3_99',
        'pattern32': 'surrogate_canesm2_99'},
    'rcp85': {
        'pattern1': 'surrogate_mri-cgcm3_01',
        'pattern2': 'surrogate_gfdl-esm2g_01',
        'pattern3': 'surrogate_mri-cgcm3_06',
        'pattern4': 'surrogate_gfdl-esm2g_06',
        'pattern5': 'surrogate_mri-cgcm3_11',
        'pattern6': 'surrogate_gfdl-esm2g_11',
        'pattern28': 'surrogate_gfdl-cm3_89',
        'pattern29': 'surrogate_canesm2_89',
        'pattern30': 'surrogate_gfdl-cm3_94',
        'pattern31': 'surrogate_canesm2_94',
        'pattern32': 'surrogate_gfdl-cm3_99',
        'pattern33': 'surrogate_canesm2_99'}}