Make lc_tbl.h public

[dmknutsen]

Checklist (Please check before submitting)

• [x] I reviewed the Contributing Guide.
• [x] I reviewed the README file to see if the feature is in the major future work.
• [x] I performed a cursory search to see if the feature request is relevant, not redundant, nor in conflict with other tickets.

Is your feature request related to a problem? Please describe. lc_tbl.h defines macros used in table generation and should be made public.

Requester Info Dan Knutsen NASA Goddard