minor, provide regression test for leap year bug

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'test/leap-years' into next

* test/leap-years:
  minor, provide regression test for leap year bug
Merge branch 'next'

* next:
  minor, provide regression test for leap year bug
  revert, allow leap day in schema lines if restriction is entirely in a leap year
  minor, migrate trod.c and schema.c to using daisy.c funs
  minor, outsource common daisy related funs to daisy.c
  fix, allow leap day in schema lines if restriction is entirely in a leap year