Adds time-related constraint methods to Bignum.

Should fix time-related constraint failures on 32-bit systems.
===BZ:Fixes=== 1011964
Fix for case-insensitive parameters is no longer tech preview.
Merge branch 'bugfix/bz1011964' into release/v0.16.4
Updated specfile for 0.16.4
bumping version from 0.16.3 to 0.16.4
distribution build workflow improvement
Releasing version 0.16.4.