todo

ZFOURGE
  Check/implement merger correction (3)

    write tests for schechter func (6)
  write tests for moved binary search/growth over time (5)
  write tests for merger correction (4)

SFH
  Integration test
    Have broken it... (2)

SFR
  Integration test
  Call only when data is of correct age (0.5 - 3.0)
    Code is butt ugly. Clean up and write tests (1) 


TESTS
  Use subTest everywhere it should be
  Use setUpClass instead of setUp where applicable
  Check how z_to_t is being done









ERRORS FOUND
  SFH data over 3 different regions (correctly weight over 2, don't over 3
  Used overall actual weights, rather than weights in each bin



QUESTIONS
  Ensure that SFH data should be multiplied by 0.64

  Phi in zfourge data is log10 and not ln?