minor, retire phvec_stats building
minor, make ph_find() return a phtups_t object (or NULL)
minor, actually generate some code
hygiene, don't pollute high-level object with auxiliary stuff
minor, redo phtups_perfp(), using a greedy and naive approach
minor, support k-perfect hashes
chore, kick _augmp() and _apply()
minor, leave greedy approach but provide bmap generation from descendingly sorted bcnt vector
minor, allow to resize smax twice before giving up on perfect hash
minor, generate useful code that allows plugging in a tester
Merge branch 'core/codegen'

* core/codegen:
  minor, generate useful code that allows plugging in a tester
  minor, allow to resize smax twice before giving up on perfect hash
  minor, leave greedy approach but provide bmap generation from descendingly sorted bcnt vector
  chore, kick _augmp() and _apply()
  minor, support k-perfect hashes
  minor, redo phtups_perfp(), using a greedy and naive approach
  hygiene, don't pollute high-level object with auxiliary stuff
  minor, actually generate some code
  minor, make ph_find() return a phtups_t object (or NULL)
  minor, retire phvec_stats building