[migration] don't add new elements to config._cubes in remove_cube We're expanding dependencies based on the current versions of the cubes, which may well not be the same as the ones known by the db (we're in the middle of an upgrade, after all). Listing them in config._cubes prevents us from calling add_cube() later to actually add them. Closes #4002156

\.svn
^build$
^dist$
\.pyc$
\.pyo$
\.bak$
\.old$
\~$
\#.*?\#$
\.swp$
^doc/book/en/apidoc$
\.old$
syntax: regexp
.*/data/database/.*\.sqlite
.*/data/database/.*\.config
.*/data/database/tmpdb.*
.*/data/ldapdb/.*
^doc/html/
^doc/doctrees/
^doc/book/en/devweb/js_api/
data/pgdb/