Revert "Add signed modulus"
Revert "Add signed modulus"

This reverts commits 5fa624d27e4e6ae3b9d268b02ce79b712598caff and
81cc1d5632415f2b4e661f754b324a9b66875198.

rsaarelm/urbit,galenwp/urbit,dphiffer/urbit,urbit/archaeology-factor,dcow/urbit,jpt4/urbit,chc4/urbit,8l/urbit,philipcmonk/urbit,Gunga/urbit,daveloyall/urbit,philippeback/urbit,philippeback/urbit,rsaarelm/urbit,8l/urbit,dphiffer/urbit,Gunga/urbit,burtonsamograd/urbit,galenwp/urbit,daveloyall/urbit,chc4/urbit,urbit/archaeology2,galenwp/urbit,yebyen/urbit,bvschwartz/urbit,bollu/urbit,daveloyall/urbit,chc4/urbit,urbit/archaeology2,8l/urbit,jpt4/urbit,8l/urbit,bollu/urbit,galenwp/urbit,philipcmonk/urbit,philippeback/urbit,bollu/urbit,yebyen/urbit,urbit/archaeology2,bollu/urbit,Gunga/urbit,jpt4/urbit,8l/urbit,philippeback/urbit,daveloyall/urbit,dphiffer/urbit,Gunga/urbit,burtonsamograd/urbit,chc4/urbit,dcow/urbit,bvschwartz/urbit,philipcmonk/urbit,rsaarelm/urbit,dcow/urbit,chc4/urbit,philipcmonk/urbit,dphiffer/urbit,dphiffer/urbit,galenwp/urbit,bollu/urbit,urbit/archaeology2,daveloyall/urbit,philippeback/urbit,philippeback/urbit,bvschwartz/urbit,urbit/archaeology-factor,dphiffer/urbit,daveloyall/urbit,yebyen/urbit,urbit/archaeology2,Gunga/urbit,jpt4/urbit,urbit/archaeology2,urbit/archaeology2,yebyen/urbit,bvschwartz/urbit,philipcmonk/urbit,dphiffer/urbit,rsaarelm/urbit,yebyen/urbit,galenwp/urbit,philippeback/urbit,bollu/urbit,rsaarelm/urbit,jpt4/urbit,rsaarelm/urbit,philipcmonk/urbit,dcow/urbit,philipcmonk/urbit,galenwp/urbit,philipcmonk/urbit,8l/urbit,Gunga/urbit,burtonsamograd/urbit,philipcmonk/urbit,jpt4/urbit,burtonsamograd/urbit,daveloyall/urbit,burtonsamograd/urbit,chc4/urbit,chc4/urbit,philippeback/urbit,bvschwartz/urbit,galenwp/urbit,dcow/urbit,dcow/urbit,rsaarelm/urbit,urbit/archaeology2,daveloyall/urbit,chc4/urbit,dphiffer/urbit,dphiffer/urbit,jpt4/urbit,urbit/archaeology-factor,bvschwartz/urbit,rsaarelm/urbit,rsaarelm/urbit,bvschwartz/urbit,jpt4/urbit,yebyen/urbit,daveloyall/urbit,daveloyall/urbit,8l/urbit,urbit/archaeology-factor,dcow/urbit,bvschwartz/urbit,yebyen/urbit,yebyen/urbit,bollu/urbit,burtonsamograd/urbit,dphiffer/urbit,urbit/archaeology-factor,8l/urbit,chc4/urbit,urbit/archaeology-factor,urbit/archaeology2,philippeback/urbit,bollu/urbit,bollu/urbit,Gunga/urbit,8l/urbit,bollu/urbit,urbit/archaeology-factor,galenwp/urbit,dcow/urbit,jpt4/urbit,8l/urbit,burtonsamograd/urbit,jpt4/urbit,urbit/archaeology-factor,philippeback/urbit,yebyen/urbit,chc4/urbit,Gunga/urbit,rsaarelm/urbit,burtonsamograd/urbit,galenwp/urbit,philipcmonk/urbit,bvschwartz/urbit,urbit/archaeology-factor,urbit/archaeology-factor,burtonsamograd/urbit,bvschwartz/urbit,dcow/urbit,yebyen/urbit,burtonsamograd/urbit,Gunga/urbit,Gunga/urbit