Raise invalid_argument when InitSpaceGroup fails

Throw `invalid_argument` instead of `ObjCrystException`.
Avoid XML state files that are created by ObjCrystException.

Author: pavoljuhas

ObjCryst/ObjCryst/CIF.cpp

@@ -1120,12 +1120,12 @@ Crystal* CreateCrystalFromCIF(CIF &cif,const bool verbose,const bool checkSymAsX
             unsigned int bestscore=0;
             for(vector<string>::const_iterator posOrig=origin_list.begin();posOrig!=origin_list.end();++posOrig)
             {
-               // The origin extension may not make sense, so we need to watch for ObjCrystException
+               // The origin extension may not make sense, so we need to watch for exception
                try
                {
                   pCryst->GetSpaceGroup().ChangeSpaceGroup(hmorig+*posOrig);
                }
-               catch(ObjCrystException e)
+               catch(invalid_argument)
                {
                   continue;
                }

ObjCryst/ObjCryst/SpaceGroup.cpp

@@ -603,7 +603,7 @@ void SpaceGroup::InitSpaceGroup(const string &spgId)
       {
          (*fpObjCrystInformUser)("Could not interpret Spacegroup Symbol:"+spgId);
          string emsg = "Space group symbol '" + spgId + "' not recognized";
-         throw ObjCrystException(emsg);
+         throw invalid_argument(emsg);
       }
    }
 
@@ -654,7 +654,7 @@ void SpaceGroup::InitSpaceGroup(const string &spgId)
       }
       VFN_DEBUG_EXIT("SpaceGroup::InitSpaceGroup() could not interpret spacegroup:"<<spgId<<":"<<ex.what(),8)
       string emsg = "Space group symbol '" + spgId + "' not recognized";
-      throw ObjCrystException(emsg);
+      throw invalid_argument(emsg);
    }
 
    mExtension=this->GetCCTbxSpg().match_tabulated_settings().extension();