GitLab

Fixes #264

we continue to use the duplicating version of eliminate_if_term for
atomic formulas but we replace if-then-else with epsilon in Tlet and Tcase

this time with a manually-optimized tail call
(and auto-deref applied to all references in this file)

This breaks extraction of multiprecision/wmpn.mlw.

Need some code refactoring, especially to avoid some (likely) unecessary module
translations.

This also adds an mli file for apply.