[connection] replace .running_dbapi_query with .hooks_in_progress The thing was badly named. It tries to help distinguish between queries issued directly by the programmer (e.g in the views: cnx.execute(...)) from queries issued from the hooks, operations ... or even the repository or the native source objects. It worked heuristically being associated with the security being disabled. We provide a better name and an implementation distinct from the security management methods. Related to #3933480.

[dataimport] Turn the module into a package Just `hg mv` dataimport.py and test/unittest_dataimport.py.

[dataimport] Properly escape strings sent to COPY FROM (closes #5278743) See http://www.postgresql.org/docs/9.1/static/sql-copy.html#AEN64296 for escaping codes.