[test] update sobjects/test/unittest_email to cw 3.19 api

[wsgi] the spec says wsgi.url_scheme *must* be provided No need to be defensive, anything else is a bug in the gateway.

[shell] provide autocompletion for rql queries in cubicweb-ctl shell (closes #3560541) Use the ``rql.suggestions`` component to complete user's input - readline calls the ``complete`` method with user's input, - the ``complete`` method asks for each known completers if it can suggest completions for user's input.

[book] avoid '~' in all-in-one.conf, it is not expanded Closes #3753213

[book] uicfg moved from web to web.views a while ago

[wsgi] look at wsgi.url_scheme to decide if we're on https The server/gateway is supposed to fill it in for us.

[web] Fix HEAD request handling (closes #3677949) Don't special-case HEAD in CubicWebRequestBase.is_client_cache_valid so we don't return garbage. HEAD is supposed to return the actual headers that a GET would return, which we can't do if we bypass all the normal cubicweb logic. In particular, we no longer always return 200, and return the right Content-Length/Content-Type/...

[wsgi] avoid reading the entire request body in memory Import POST form handling code from https://raw.github.com/defnull/multipart/master/multipart.py to avoid reading arbitrary amounts of data from the network in memory. NOTES: - In the twisted case we limit the max request content-length to 100MB (by default), which seems kind of arbitrary, but avoids this issue - werkzeug.formparser has suitable code as well, but I don't know if we want to add it as a dependency

Added tag cubicweb-version-3.17.15, cubicweb-debian-version-3.17.15-1, cubicweb-centos-version-3.17.15-1 for changeset ee413076752b

[pkg] also bump __pkginfo__