[GRASS5] [bug #2994] (grass) v.in.ascii: remove new vector if import failed

this bug's URL: http://intevation.de/rt/webrt?serial_num=2994
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Subject: v.in.ascii: remove new vector if import failed

(points mode)
If v.in.ascii fails to successfully load in data (say because of a bad input
file), it leaves a broken vector file behind in the mapset. This should be
removed if v.in.ascii exits with an error.

Hamish

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