First commit towards replacing pCon-> with someFunc(pCon)

This is accompanied with the removal of dead code in conman.c and else

exebuf.c

@@ -304,7 +304,7 @@ int exeBufProcess(pExeBuf self, SicsInterp * pSics,
     Log(INFO,"com","%s:batch:%s", ConID(pCon), cmd);
     status = Tcl_Eval(pTcl, cmd);
     if (status != TCL_OK) {
-      if (pCon->sicsError == 0) {
+      if (SCGetSicsError(pCon) == 0) {
         /*
            Tcl Error
          */
@@ -314,7 +314,7 @@ int exeBufProcess(pExeBuf self, SicsInterp * pSics,
         }
       } else {
         SCWrite(pCon, pTcl->result, eError);
-        pCon->sicsError = 0;
+        SCSetSicsError(pCon,0);
       }
       SCWrite(pCon, "ERROR: above error was in block:", eError);
       SCWrite(pCon, cmd, eError);