This partially reverts 2bf11f4f.  There is no need to add new Makefile targets as the Makefile already forwards all targets to Makefile.coq.

It is sometimes not desirable to do so.

For example, instead of:

  Notation "( X ⊆ )"

We now use:

  Notation "( X ⊆)"

We were already doing this for = and ≡.

This solves some conflicts with the notations of MetaCoq.

To make it consistent with Forall_impl and map_Forall_impl. Also, put
the premises in the same order as those lemmas.

also add html folder to .gitignore so generated doc is not added to the repo

Based on the one of Ralf Jung for Iris.

Some were already maximally implicit, some were not. Now it is consistent.

update build system and README

See merge request !1

It no longer requires the functions on both sides of the relation
to be syntactically the same.

This fixes issue #65.

This approach is originally by Robbert

Fix fixes issue #63.

Rename:

- prefix_of -> prefix and suffix_of -> suffix because that saves keystrokes
  in lemma names. However, keep the infix notations with l1 `prefix_of` l2 and
  l1 `suffix_of` l2 because those are easier to read.
- change the notation l1 `sublist` l2 into l1 `sublist_of` l2 to be consistent.
- rename contains -> submseteq and use the notation ⊆+