LIGO lexer later). Added field [is_file] to the state of the
lexer to know if the input is a file or not (insert or not a
first line directive). Fixed ReasonLIGO comments in
entrypoints-contracts.md and website2.religo. WIP on the LIGO
lexer to properly handle comments for all the syntaxes.
Preprocessor is now a library installed by opam.
Replaced ligolang@gmail.com by contact@ligolang.org in opam files.
Reformatted some opam files.
Removed #line directive from preprocessor.
Added to the interface of ParserUnit.
Script messages.sh now checks the identity of .msg and .msg.old
to avoid undue warning about possibly different LR items.