A fix and a test case for Bug#10760 and complementary cleanups.

The idea of the patch
is that every cursor gets its own lock id for table level locking.
Thus cursors are protected from updates performed within the same 
connection. Additionally a list of transient (must be closed at
commit) cursors is maintained and all transient cursors are closed
when necessary. Lastly, this patch adds support for deadlock
timeouts to TLL locking when using cursors.
+ post-review fixes.

sql/examples/ha_example.h

@@ -45,9 +45,7 @@ class ha_example: public handler
   EXAMPLE_SHARE *share;    /* Shared lock info */
 
 public:
-  ha_example(TABLE *table): handler(table)
-  {
-  }
+  ha_example(TABLE *table_arg);
   ~ha_example()
   {
   }