Re: [Gnumed-devel] small change to address postcode events.

[sjtan]

There is a small change to business/gmDemographicRecord (new function ) 
and a small change
to wxpython/gmDemographics , to let a user enter a postcode first, then 
pick from a restricted
urb
picklist ( or accept the top item in the restricted picklist , which is 
default).
To unset the urb picklist restriction , the postcode field has to be 
cleared.
- used existing gmMatchProvider.setContext code for the urb MP subclass.
- also externally set input_was_selected flag if the urb field fills in 
the postcode field, so
that tabbing past the postcode field from the urb field doesn't clear it 
because input_was_selected
wasn't set by phraseWheel.SetValue() method. Maybe overload setValue() 
to do this, but
input_was_selected flag may be for other things other then clearing the 
phrase wheel's text field.

In the context of urb field autofilling postcode field and having to 
navigate past postcode field ,
it seemed a good workaround without having to make it the default 
behaviour for phrasewheel.