[GNC-dev] avoid the brain dead import

[Wm]

in case it is appropriate to your import, don't allow it to check every 
transaction in your existing file against the one you want to import and 
know is unique [1]

[1] who thought that was a good idea anyway ?

redefine your import as a multi=split, then it doesn't seem to do the 
zombie behavior.

results here?

12 line import as singles?  45 minutes

same tx as multi-split? as fast as I can press the buttons

why are imported tx being checked against the existing ones in the first 
place?  shouldn't a person know if they are introducing new tx to their 
file?  are we really presuming *all* our users are so dumb they just 
keep on importing the same tx over and over again ?

'kin hell, not a good view of the import writer about the presumed 
importer, I mean if they are so fucking stupid you'd be surprised they 
manage accounting at all