[devtools/testlib,fill] use the new connection api (for auto_populate) Note that this changes API of CubicWebTC's custom_populate and post_populate methods to take a connection instead of a cursor, which may affect some cubes.

addressbook
basket
blog
book
calendar
comment
company
email
file
folder
i18ncontent
keyword
link
mailinglist
person
tag
timeseries
vcsfile