1) Correct the handling of SQL_C_ULONG (for *nix).

1) Correct the handling of SQL_C_ULONG (for *nix).
2) Prevent plan deallocation errors when the transaction
   is in abort status.
3) Avoid a connection failure when notice message arrives.
4) Improve the handling of mutex(critical section).
5) Correct the cursor open check.
6) Change the Unicode driver to set the NULL terminator
   of SQL_C_WCHAR type data properly.
7) Add some m(re)alloc error check.
8) Add proper cleanup steps for some functions.
9) Return proper min & max scale for timestamp data type.
10) Return proper scale for timestamp data fields.
11) Fix the bug that .009 numeric generates .9 output. (George A.J)