Bug #638543: Remove the counter() method from the backends.

Patch by Matthijs Kooijman:

This method is not implemented by either of the backends and removing it
makes the subsequent commits possible.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@20052 57a11ea4-9604-0410-9ed3-97b8803252fd

src/backend/dbi/gnc-backend-dbi.c

@@ -1310,8 +1310,6 @@ init_sql_backend( GncDbiBackend* dbi_be )
     be->commit = gnc_dbi_commit_edit;
     be->rollback = gnc_dbi_rollback_edit;
 
-    be->counter = NULL;
-
     /* The gda backend will not be multi-user (for now)... */
     be->events_pending = NULL;
     be->process_events = NULL;

src/backend/xml/gnc-backend-xml.c

@@ -1219,8 +1219,6 @@ gnc_backend_new(void)
     be->free_query = NULL;
     be->run_query = NULL;
 
-    be->counter = NULL;
-
     /* The file backend will never be multi-user... */
     be->events_pending = NULL;
     be->process_events = NULL;

src/libqof/qof/qofbackend-p.h

@@ -156,9 +156,6 @@
  *    data. Database backends should implement a more intelligent
  *    solution.
  *
- * The counter() routine increments the named counter and returns the
- *    post-incremented value.  Returns -1 if there is a problem.
- *
  * The events_pending() routines should return true if there are
  *    external events which need to be processed to bring the
  *    engine up to date with the backend.
@@ -317,7 +314,6 @@ struct QofBackend_s
     void (*load_config) (QofBackend *, KvpFrame *);
     /*@ observer @*/
     KvpFrame* (*get_config) (QofBackend *);
-    gint64 (*counter) (QofBackend *, const char *counter_name);
 
     gboolean (*events_pending) (QofBackend *);
     gboolean (*process_events) (QofBackend *);

src/libqof/qof/qofbook.c

@@ -409,12 +409,7 @@ qof_book_get_counter (QofBook *book, const char *counter_name)
         return -1;
     }
 
-    /* If we've got a backend with a counter method, call it */
-    be = book->backend;
-    if (be && be->counter)
-        return ((be->counter)(be, counter_name));
-
-    /* If not, then use the KVP in the book */
+    /* Use the KVP in the book */
     kvp = qof_book_get_slots (book);
 
     if (!kvp)