genelkim/ulf-lib

Tense types should be three-valued

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tense types should be

  1. unspecified
  2. untensed
  3. tensed

Right now we only have two so we can't specify domains that allow both. Had to hack the semtype-equal? function to get the unspecified nature working.

This is handled as part of #38 and all the details are worked out in #37