new: add selection query param; fix: end segment
new: add selection query param; fix: end segment

New: selection query - can now select subset of records to export using
Arc sql query expression. Works, but only limited testing done. There
are likely problems with operating system quoted characters and the
like. Field names need to be triple double quoted, values single quoted.

Fixed: Interior ring segment didn't have new line, causing following
coords to be off by one.

maphew/arcplus,maphew/arcplus,DougFirErickson/arcplus