Saved some shift operations.
Allow xdigit to be written as 0x or 0X.
Fix: unchecked value in arithmetic comparison.
Modified parameter -Oi to allow a generic arithmetic comparison on
option values like skbmark, skbprio and skbqueue.
Update synopsis of -Oi and add examples of new features.
Bump version to 3.2.
Fix: Correct synopsis for -Oi.
Bump version to 3.2.1.