no_result_for_http_status contains a list of HTTP status.
These HTTP status are seen an empty result list.
In other cases an exception is thrown as usual.
Previously raise_for_httperror were ignoring all HTTP error,
which make defective engines invisible in the stats.
With the POST method, autocomplete.js does not URL encode the values.
For example "1+1" is sent as "1+1" which is read as "1 1" since space are URL encoded with a plus.
There is no clean way to fix the bug since autocomplete.js seems abandoned.
The commit monkey patches the ajax function of autocomplete.js
Related to #1695
The previous value was 80em (1280px).
Some desktop screens have this resolution,
and tablet layout takes too much space in this configuration
This PR switch to the table layout for screen width strictly below 1280px.
Close https://github.com/searxng/searxng/issues/874