[GRASS-dev] v.in.ogr: 'NULL' support activated for OFTInteger and OFTReal

Hi,

while fixing the missing OFTDate, I have also activated
the previously commented support for NULL for OFTInteger and
OFTReal types.

Example with DBF driver:

v.db.select natpol col=FLAECHEID,NEW_DATE,VISIBLE
FLAECHEID|NEW_DATE|VISIBLE
0|2005/10/18,F

v.db.update natpol col=FLAECHEID value=NULL

v.db.select natpol col=FLAECHEID,NEW_DATE,VISIBLE
FLAECHEID|NEW_DATE|VISIBLE
|2005/10/18,F

Markus