Kcorrect

Adds feature to return kcorrect and MC of kcorrect from absmag() and absmag_mc() methods of Kcorrect object.

- Update LINCCC template
- Change absmag outputs to be -9999 when maggies<=0, instead of reconstructed value.
- Add option to kcorrect.kcorrect.Kcorrect.absmag() to additionally return reconstructed absmags
- Add option to kcorrect.kcorrect.Kcorrect.absmag() to additionally return absmag one-sigma limits

**Full Changelog**: https://github.com/blanton144/kcorrect/compare/5.1.1...5.1.2

Minor change to remove extraneous print statement.

New Python template, moves python `kcorrect` out of beta.

Alpha candidate testing LINCC template