Add "no_clip" to plot, text, contour and meca

[seisman]

Description of proposed changes

This PR adds the no_clip argument (alias of -N) to plot, text, countour and meca.

The name no_clip was agreed when wrapping the grdimage method in #620 (comment)

Fixes #

Reminders

• Run make format and make check to make sure the code follows the style guide.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Add new public functions/methods/classes to doc/api/index.rst.
• Write detailed docstrings for all functions/methods.
• If adding new functionality, add an example to docstrings or tutorials.

[weiji14]

Just a few minor comments, otherwise fine.

On a related note, should probably improve the documentation of plot at https://www.pygmt.org/v0.2.0/api/generated/pygmt.Figure.plot.html#pygmt.Figure.plot since it's quite widely used. I was going to do it in #471 but might be better to have a separate PR handling it specifically.

[weiji14]

Ok, good to merge. The macOS test breakages seem unrelated, not sure why there's a segmentation fault on the xarray shading test?

[seisman]

The macOS test breakages seem unrelated, not sure why there's a segmentation fault on the xarray shading test?

In PR #650, I added more tests for xarray shading. These tests work well for GMT master, but not for 6.1.1. Perhaps some of the tests have segmentation faults with GMT 6.1.1.