restructured configuration (ofac.c)

- ofac.c contains now only the command in initialisation function list
- the other functions are moved to sicsutil.c
- moved DoubleTime and the content of access.c to sicsutil.c
- moved some initialisation code from ofac.c to the corresponding modules

background.h

@@ -21,6 +21,6 @@ int BackgroundCommand(SConnection * pCon, char *command);
 /*
  * used only once for installing Background
 */
-void InstallBackground(SicsInterp * pSics);
+void InstallBackground(void);
 
 #endif                          /*BACKGROUND_H_ */