Don't needlessly copy all the records.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>

newfol

@@ -1012,12 +1012,12 @@ def import_into(db, dtbname, dbtype, minfields=0, strict=False, identity=False):
 
 def export_from(db, table, dbtype):
     vault = filemanip.FileStorage(dbtype, sys.stdout)
-    recs = db.records()
+    f = lambda x: True
     if table is None and dbtype == "csv":
         raise newfol.exception.NewfolError("A table is required for csv")
     if table is not None:
-        recs = db.records(lambda x: x.table == table)
-    vault.store(recs)
+        f = lambda x: x.table == table
+    vault.store(db.records(f))
 
 def parse_args(args):
     parser = argparse.ArgumentParser(description="store and manipulate fol")