#659 (Dec 31, 2016, 8:22:05 AM)

1. more elementary rules about div / mod on int (detail / hgweb)
2. complete set of cases rules for integers known to be (non-)positive/negative;
   legacy theorem branding (detail / hgweb)
3. more facts on sgn, abs (detail / hgweb)
4. dropped slightly outdated comment (detail / hgweb)

Started by an SCM change

This run spent:

• 5 min 3 sec waiting;
• 1 hr 31 min build duration;
• 1 hr 36 min total from scheduled to completion.