add "export terms table" option + corresponding logic and api route (ex: http://localhost:8000/api/ngramlists/export?corpus=4543)

groups in table: more detailed DELETE (subform params) and convert old POST method to PUT (for symmetry) (all params are in url)

Conflicts:
	templates/pages/projects/project.html

annotations: add possibility to overhighlight a maplist term via route projects/1/corpora/81/documents/83/focus=2677 where 2677 is the id of the term to highlight