Fix of LP#616253 Crash in _ma_bitmap_set_full_page_bits on Aria recovery

The bug was based on wrong undo data in recovery file and not enough checking of bad data.

sql/sql_select.h:
  Added comment
storage/maria/ma_blockrec.c:
  - Removed wrong sanity checks (didn't work for UNDO records)
  - More sanity checks and DBUG_ASSERT
  - More DBUG_ENTER and DBUG_PRINT
  - Removed filler blocks in extent_to_bitmap_blocks() as it caused problems in write_block_record().
    This was the main cause of the bug.
    (This change can make records generated by UNDO slightly smaller than original record, which we have to fix
    by correcting row_pos.length before calling write_block_record())
  - Fixed some problems in write_block_record() while doing UNDO.
  - Store header_length without TRANSID_SIZE into recovery log (as UNDO entires doesn't have TRANSID_SIZE)
  - Mark table crashed if something goes wrong during UNDO
storage/maria/maria_def.h:
  Added header_length

sql/sql_select.h

@@ -365,6 +365,11 @@ class JOIN :public Sql_alloc
     the number of rows in it may vary from one subquery execution to another.
   */
   bool no_const_tables; 
+  /*
+    This flag is set if we call no_rows_in_result() as par of end_group().
+    This is used as a simple speed optimization to avoiding calling
+    restore_no_rows_in_result() in ::reinit()
+  */
   bool no_rows_in_result_called;
   
   /**

storage/maria/maria_def.h

@@ -459,8 +459,9 @@ typedef struct st_maria_row
   uint *null_field_lengths;             /* All null field lengths */
   ulong *blob_lengths;                  /* Length for each blob */
   ulong min_length, normal_length, char_length, varchar_length;
-  ulong blob_length, head_length, total_length;
+  ulong blob_length, total_length;
   size_t extents_buffer_length;         /* Size of 'extents' buffer */
+  uint head_length, header_length;
   uint field_lengths_length;            /* Length of data in field_lengths */
   uint extents_count;                   /* number of extents in 'extents' */
   uint full_page_count, tail_count;     /* For maria_chk */