[website] Only propose environments compatible with the selected algorithm on the experiment setup page

[website] Don't allow to fork, copy, add a new version of a binary algorithm without a shared library

There has been API changes in the latest versions that will requires some work in the
beat.web codebase

Remove requirement for sphinxcontrib-ansi



See merge request !213

Issue 433

Closes #433 

See merge request !211

[many] Allow backup to operate on implicit order (c.f. #433)



See merge request !210

Issue 425

Improves on the solution for issue #425

See merge request !209

[search] Allow user to hit ENTER for updating the search; Be more flexible with …

…search terms (closes #424)

See merge request !208

[search] Allow user to hit ENTER for updating the search; Be more flexible with search terms (closes #424)

[api] Fix access permissions for diff-view on usable objects

Closes #425 

See merge request !207