Added the ability to force dismount a tape using the generic interface

To forcefully dismount a tape means to rewind and eject the tape
where necessary.  This modification adds the ability to force dismount
to the MediaChangerFacade and the CASTOR acsd daemon.

mediachanger/castorrmc/common/serror.c

@@ -341,6 +341,7 @@ const char *sys_terrlist[ETMAXERR-ETBASEOFF+2] =
    "Failed to mount volume",
    "Failed to dismount volume",
    "Failed to query volume",
+   "Failed to force dismount volume",
    "BAD ERROR NUMBER"
   };
 

mediachanger/castorrmc/h/serrno.h

@@ -351,7 +351,8 @@
 #define ETMOUNTFAILED	ETBASEOFF+41    /* Failed to mount volume */
 #define ETDISMOUNTFAILED ETBASEOFF+42   /* Failed to dismount volume */
 #define ETQUERYVOLFAILED ETBASEOFF+43   /* Failed to query volume */
-#define ETMAXERR        ETBASEOFF+43
+#define ETFDISMOUNTFAILED ETBASEOFF+44  /* Failed to force dismount volume */
+#define ETMAXERR        ETBASEOFF+44
 
 /*
  *------------------------------------------------------------------------