Fixed comment.

Change-Id: I48d8ed8e218508f4f2d8f377fa9052ba02e61f37
Use hairlines judiciously to draw very thin patterned strokes correctly.

This prevents some dashed or dotted lines from being skipped when printing
or in print preview.

Change-Id: I9d0a8ae743241d17d65935f4bf0d122e4313bff8
More fine-tuned stroke patterns.

Only the pixel map mode is visually inspected.

Change-Id: Ia8ac978a0d3049d7e7162f1157822b85d475dfdf
Map Excel's normal dashed line to our FINE_DASHED.

Excel's medium dashed maps better with our regular DASHED pattern.

Change-Id: I9c7161ced9592b6c6617d6edbc616e0b1c3dc1e8