Adding multi_range_read support to partitions

Other things:
- Cleanup of allocated bitmaps done in open(), which
  simplifies init_partition_bitmaps()
- Add needed defines in ha_spider.cc to enable new spider code
- Fixed some DBUG_PRINT() to be consistent with normal code
- Removed end space
- The changes in test cases partition_innodb, partition_range,
  partition_pruning etc are becasue partitions can now more exactly
  calculate the number of rows in a range.

Contains spider patches:
014,015,023,033,035,037,040,042,044,045,049,050,051,053,059

include/my_bitmap.h

@@ -45,6 +45,8 @@ extern "C" {
 /* compatibility functions */
 #define bitmap_init(A,B,C,D) my_bitmap_init(A,B,C,D)
 #define bitmap_free(A) my_bitmap_free(A)
+/* Reset memory. Faster then doing a full bzero */
+#define my_bitmap_clear(A) ((A)->bitmap= 0)
 
 extern void create_last_word_mask(MY_BITMAP *map);
 extern my_bool my_bitmap_init(MY_BITMAP *map, my_bitmap_map *buf, uint n_bits,