Add jsdoc to setVisibility.
Make it easier to set breakpoints while testing CanvasAssertions.numLinesDrawn.
Add method to auto tests' proxy to clear the call list for better testing.
Make connectSeparatedPoints a per-series option. Add automated test and visual test.
Nit comment resolution for pull request 271 (making connectSeparatedPoints per-series aware.)
Code comments and indentation fixes.
Fill in dygraph-extern.js.