[GRASSLIST:498] v.in.dxf updated

[Huidae Cho]

Hi,

I have updated v.in.dxf to support LWPOLYLINE and TEXT objects.  LWPOLYLINE was
introduced after DXF R10, so the chance is good that newer DXF files will be
imported.

One problem with TEXT is that the module actually creates points and attaches
text labels through the "label" field in the linked table.  Created tables will
have two fields: cat (integer), label (varchar(256)) and TEXT will be stored in
the label field.  Since the label is actually not a graphic object in this
case, rotation of text and the label box (cannot determine the dimension of
label) are not supported.

Linking labels and objects is not implemented.

Huidae Cho