Allow the user to choose the fill rule used for paths when stroking

[fryguybob]

(Imported from http://code.google.com/p/diagrams/issues/detail?id=28. Original issue from byor...@gmail.com on May 4, 2011, 08:00:07 PM UTC)

The stroke and strokeT functions should take an extra argument (actually, we should make functions stroke' and strokeT' that take a record of optional arguments, like e.g. cat) specifying the "fill rule" (winding rule or even/odd; default should probably be winding). This should have two effects: 1. use the appropriate testing function for constructing the stroked diagram's Query; 2. set an attribute on the stroked diagram informing the backend which fill rule to use. The Cairo backend should also be updated to take this attribute into account.

[fryguybob]

(Imported. Original comment by byor...@gmail.com on September 2, 2011, 09:20:16 PM UTC)

in diagrams-lib:

Fri Sep 2 17:18:37 EDT 2011 Brent Yorgey byorgey@cis.upenn.edu

• add user-controllable fill rules for paths

in diagrams-cairo:

Fri Sep 2 17:18:58 EDT 2011 Brent Yorgey byorgey@cis.upenn.edu

• handle fill rule attribute