Elim. more pesky \t's.  Where do they come from?
Got sklearn back into working shape as well

There needs to be some additional work, e.g., correcly implementing a UDA API for BDF, rather than the hacky query construction currently used.
Fixed issue with overloading _where
Added missing import
More missing imports
Merge remote-tracking branch 'github_master/master'
Added context manager support to dbapi objects