Change military hatching to 16px and use global alignment

Fixes #97

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I went with a 16px image because 24 is not a factor of 256.

Options for horizontal space between hatchings are

**16**, 17.07, 18.29, 19.69, 21.33, 23.27, 25.6, 28.44, **32**

Anything other than 16 and 32 will get aliasing.