Simplify numeric handling in datacopy

SYBDECIMAL and SYBNUMERIC are binary the same in sql server

Signed-off-by: Frediano Ziglio <freddy77@gmail.com>
Use correct precision/scale for numeric in datacopy

Use the new SRCNUMERICBIND in datacopy to copy precision/scale during
data copying.
This bind type preserve the source precision/scale.

Signed-off-by: Frediano Ziglio <freddy77@gmail.com>