remove experimental feature

We decided to only implement a very basic pipeline as default.

modelling/pymod/_pipeline.py

@@ -403,8 +403,7 @@ def CheckFinalModel(mhandle):
             ost.LogInfo("Stereo-chemical problem in sidechain " + \
                         "of residue " + str(res))
 
-def BuildFromRawModel(mhandle, alternative_mhandles=None,
-                      use_amber_ff=False, extra_force_fields=list()):
+def BuildFromRawModel(mhandle, use_amber_ff=False, extra_force_fields=list()):
     '''Build a model starting with a raw model (see :func:`BuildRawModel`).
 
     This function implements a recommended pipeline to generate complete models
@@ -459,19 +458,6 @@ def BuildFromRawModel(mhandle, alternative_mhandles=None,
     torsion_sampler = loop.LoadTorsionSamplerCoil()
     merge_distance = 4
 
-    # try to extend terminal coverage using alternative rawmodels
-    if alternative_mhandles != None:
-        # iterate extensions until nothing happens anymore
-        current_num_residues = mhandle.model.GetResidueCount()
-        new_num_residues = None
-        while current_num_residues != new_num_residues:
-            current_num_residues = mhandle.model.GetResidueCount()
-            ModelExtensions(mhandle, alternative_mhandles, 
-                            extension_strategy="overlapping")
-            ModelExtensions(mhandle, alternative_mhandles,
-                            extension_strategy="non-overlapping")
-            new_num_residues = mhandle.model.GetResidueCount()
-
     # remove terminal gaps
     RemoveTerminalGaps(mhandle)