0.07: add SV flags (COW, PADs, ...) and OP bits

- add to B::SV::flagspv: COW, THINKFIRST, PADNAME, PADNAMELIST,
  TYPED, OUR, STATE
- add bits to B::OP::flagspv: OPT, LATEFREE, LATEFREED, ATTACHED,
  SLABBED, SAVEFREE, STATIC, FOLDED