Use boost tgamma for consistency with other boost math usage
(#407)
Start on converting Moffat to use analytic kvalues for untruncated case.
(#407)
Allow some leeway on the special beta values
(#407)
Have the maximum_fft_size check happen on both branches
(#407)
Add tests that kvalues are consistent with xvalues
(#407)
Add the do_kvalue tests for different Moffat beta values
(#407)
Fix bugs in some of the Moffat kV specializations
(#407)
Back to work on test_drawK now.
(#407)
Finish up the rest of test_drawK
(#407)
Move glob_ud out of global space and into each function where it is used.
(#407)