Added
* Environs as options:
`XDOCTEST_VERBOSE`, `XDOCTEST_OPTIONS`, `XDOCTEST_GLOBAL_EXEC`, `XDOCTEST_REPORT`,
`XDOCTEST_STYLE`, and `XDOCTEST_ANALYSIS` environment variables can now be used
to specify configuration defaults.
Changed
* Added experimental hidden feature `--insert-skip-directive-above-failures`
that can be used to modify your code such that failing doctests are marked as
skip.
* Disabled traceback suppression on module import errors (this is is
configurable via the `supress_import_errors` option).
* Xdoctest will no longer try to pre-import the module if none of its doctests
have any enabled lines. This also means global-exec statements will NOT run
for those tests, which means you can no longer use global-exec to
force enabling tests.