[session] enforce coherency of login/passwd couple values when no anonymous user (closes: #1910849) None may be returned for both if anonymous connection is not allowed or if an empty login is used in configuration Raise ConfigurationError is anonymous login is non-ascii (convention)

[session] take care of non-ascii characters in login and session id (closes: #1910849) We ensure a valid <str> conversion of the session id by using unormalize() at initialization.

closes #1914824: fix retrieval of _andor input, test and fix generated rql

[debian] build the book with no auto-compression of book files (closes: #1906581) Book content paths (html and rest) are now excluded from Debian compression step. This will fix a documentation search issue on the website (doc.cubicweb.org) Documentation build is now made optional since it can break for old distributions and we don't want to block a new release of Cubicweb because of documentation issues.

[views/navigation] use the proper icons instead of ascii art (closes #1624943)

devtools: Fix cleanup of temporary database (closes #1908656) The stored database path for clean up was not absolute. We now make the ``db-name`` absolute at database manade initialization. before storing the name for cleanup.

Drop privileges properly (closes #1910561) Use new function from logilab.common.daemon to switch to non-privileged uid and gid.

drop unittest deprecation warning

[web] add option to make resources-concat optional (implements #1910615)

backport stable