* lisp/org-latex-preview.el (org-latex-preview-precompile,
org-latex-preview--latex-preview-filter,
org-latex-preview--create-tex-file,
org-latex-preview-use-precompilation, org-latex-preview--precompile):
Rename (i) the user option that controls precompilation for LaTeX
previews, and (ii) the function that precompiles headres for LaTeX
previews. This makes the names shorter and consistent with their
corresponding equivalents in `ox-latex'.
Rename
`org-latex-preview-use-precompilation' -> `org-latex-preview-precompile'
`org-latex-preview-precompile' -> `org-latex-preview--precompile'
The new names have equivalents `org-latex-precompile' and
`org-latex--precompile' in `ox-latex'.
* testing/lisp/test-org-latex-preview.el: Update tests that set this
user option.
* etc/ORG-NEWS: Update the NEWS file.
* testing/lisp/test-org-latex-preview.el: Tests for
org-latex-preview.el.
* testing/examples/org-latex-preview-test.org: Short but
full-featured document with LaTeX fragments to run tests on.