Fix limits/threshold of projections with non-default Globe

[QuLogic]

Rationale

Some limits and thresholds are hard-coded, but this causes incorrect projections when the Globe radius is much smaller than the default. Either the map is tiny in very large limits, or lines are not projected correctly.

Implications

TransverseMercator is no longer tiny when using a small Globe radius; other projections do not cut projected lines randomly.

[dopplershift]

Code changes look good in general. Looks like this broke the test_grid_labels test in test_gridliner.py, and angered Travis by trying to generate some HTML with the result image base64-encoded.

[QuLogic]

Weird, I thought I saw that failure before making this change and thought it was unrelated, but I guess not.

[QuLogic]

The test failure is because the AzimuthalEquidistant is now missing a whole bunch of lines. I rebased hoping that your 1000-point PR would have fixed it, but it appears not.

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