Add bitvector library with automation

See merge request !408

Prepare changelog for release 1.8

See merge request !410

Refactor and improve documentation of feed and efeed tactics

See merge request !403

Refactor feed and add the feed generalize, efeed generalize, efeed inversion, and efeed destruct tactics

Rename plus/minus → add/sub and put number lemmas in modules to be consistent with Coq stdlib

See merge request !404

use the right list of authors..

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This is similar to the trick we use for `bi` and makes it possible to import
`Nat` and obtain all lemmas---i.e., those from Coq's stdlib + those from std++.

Thanks to @Blaisorblade for the suggestion.

Rename `_plus`/`_minus` into `_add`/`_sub` to be consistent with Coq's current convention for numbers.

add some very basic f_equiv tests

See merge request !409

[list] restricted version of list_fmap_equiv_ext

See merge request !384

Generalize Propers for lists / Add some missing Params

See merge request !407

Create stdpp-unstable package and add bitblast library

See merge request !402