New DB-Library overflow errors

Use of a DB-Library routine that causes in an integer overflow results in this error:

302 = SYBEINTOVFL, "DB-LIBRARY internal error: The arithmetic operation results in integer overflow."

Multiplication of the scrollopt and nrows parameters of the dbcursoropen DB-Library routine that causes an overflow results in this error:

301 = SYBCOPNOV, "dbcursoropen(): The multiplication of scrollopt and nrows results in overflow."