Moved a lot of old bug fixes and safe cleanups from Maria 5.1 tree to 5.1

- Reserver namespace and place in frm for TABLE_CHECKSUM and PAGE_CHECKSUM create options
- Added syncing of directory when creating .frm files
- Portability fixes
- Added missing cast that could cause bugs
- Code cleanups
- Made some bit functions inline
- Moved things out of myisam.h to my_handler.h to make them more accessable
- Renamed some myisam variables and defines to make them more globaly usable (as they are used outside of MyISAM)
- Fixed bugs in error conditions
- Use compiler time asserts instead of run time
- Fixed indentation
HA_EXTRA_PREPARE_FOR_DELETE -> HA_EXTRA_PREPARE_FOR_DROP as the old name was wrong
(Added a define for old value to ensure we don't break any old code)
Added HA_EXTRA_PREPARE_FOR_RENAME as a signal for rename (before we used a DROP signal which is wrong)
- Initialize error messages early to get better errors when mysqld or an engine fails to start
- Fix windows bug that query_performance_frequency was not initialized if registry code failed
- thread_stack -> my_thread_stack_size

include/m_string.h

@@ -67,7 +67,7 @@
 # define bcopy(s, d, n)		memcpy((d), (s), (n))
 # define bcmp(A,B,C)		memcmp((A),(B),(C))
 # define bzero(A,B)		memset((A),0,(B))
-# define bmove_align(A,B,C)    memcpy((A),(B),(C))
+# define bmove_align(A,B,C)     memcpy((A),(B),(C))
 #endif
 
 #if defined(__cplusplus)
@@ -129,7 +129,10 @@ extern	size_t bcmp(const uchar *s1,const uchar *s2,size_t len);
 extern	size_t my_bcmp(const uchar *s1,const uchar *s2,size_t len);
 #undef bcmp
 #define bcmp(A,B,C) my_bcmp((A),(B),(C))
-#endif
+#define bzero_if_purify(A,B) bzero(A,B)
+#else
+#define bzero_if_purify(A,B)
+#endif /* HAVE_purify */
 
 #ifndef bmove512
 extern	void bmove512(uchar *dst,const uchar *src,size_t len);