Hard stop for OASIS writer on odd-width paths and odd-diameter circles

[klayoutmatthias]

There is no option currently to enable a permissive mode. Furthermore, the test for odd diameter or width is performed before scaling. Hence saving with half the DBU is no workaround.

There are two suggestions regarding this issue:

• Perform the test after scaling, so scaling to half the DBU is an option
• Allow configuring the writer to become permissive (turn this hard error into warning)