Xfail or loosen tolerances on flaky tests

The test_nondiagonal_obs_cov one hasn't yet been seen in Debian
but is known in upstream CI:
https://github.com/statsmodels/statsmodels/pull/6475#issuecomment-581151072

Author: Rebecca N. Palmer <rebecca_palmer@zoho.com>, Graham Inggs
Bug-Debian: https://bugs.debian.org/944054
Forwarded: no

Gbp-Pq: Name 944054_flaky_tests.patch

Don't try to write to the source directory

Not allowed in autopkgtest

Author: Rebecca N. Palmer <rebecca_palmer@zoho.com>
Forwarded: no

Gbp-Pq: Name use_tmp_path.patch

Use Python 3 in script shebangs

(Skipping the two .pyx files with #!python - they need to be compiled
with Cython, not directly run with any version of plain Python)

Author: Rebecca N. Palmer <rebecca_palmer@zoho.com>
Forwarded: no

Gbp-Pq: Name python3_shebangs.patch

Loosen tolerances on some tests on i386

and xfail a test that fails for not producing ConvergenceWarning.

Failure logs:
test_smoothing
https://buildd.debian.org/status/fetch.php?pkg=statsmodels&arch=i386&ver=0.9.0-3&stamp=1567157609&raw=0
test_multivariate_switch_univariate
https://buildd.debian.org/status/fetch.php?pkg=statsmodels&arch=i386&ver=0.12.0-1&stamp=1599693472&raw=0

As it only fails on i386 and isn't far wrong,
I suspect different rounding due to x87 excess precision

Author: Rebecca N. Palmer <rebecca_palmer@zoho.com>
Bug-Debian: https://bugs.debian.org/938949
Forwarded: no

Gbp-Pq: Name i386_loosen_test_tolerances.patch

Use example data from an R package we have

Author: Rebecca N. Palmer <rebecca_palmer@zoho.com>
Forwarded: not-needed

Gbp-Pq: Name use_available_data.patch

KalmanFilter broken on armhf / hppa

Warn on use, and xfail the tests

Author: Rebecca N. Palmer <rebecca_palmer@zoho.com>
Bug-Debian: https://bugs.debian.org/924036
Bug-Ubuntu: https://launchpad.net/bugs/1819227
Forwarded: no

Gbp-Pq: Name xfail_kalman_armhf.patch

Use intersphinx inventory files from other Debian packages.

Forwarded: not-needed

Gbp-Pq: Name use-system-inventory

to prevent failed test on i386

Author: Yaroslav Halchenko <debian@onerussian.com>
Bug: https://github.com/statsmodels/statsmodels/issues/1831
Forwarded: upstream consider this probably fixed

Gbp-Pq: Name up_reduce_test_precision

Use cached datasets in tests and examples

Also remove a download that isn't actually used in that example.

This allows the tests to pass, and at least some of the examples to
be built, in an offline environment such as a Debian buildd.

The cached data is extracted from R packages by debian/datasets/*.

Author: Diane Trout <diane@ghic.org>, Rebecca N. Palmer <rebecca_palmer@zoho.com>
Forwarded: not-needed

Gbp-Pq: Name use-cached-datasets

statsmodels (0.13.1+dfsg-2) unstable; urgency=medium

  * Docs: use *_path and symlinks for local JavaScript,
    instead of (broken by CORS) sed replacements.
  * Xfail another possible rounding issue on i386.

[dgit import unpatched statsmodels 0.13.1+dfsg-2]

Import statsmodels_0.13.1+dfsg-2.debian.tar.xz

[dgit import tarball statsmodels 0.13.1+dfsg-2 statsmodels_0.13.1+dfsg-2.debian.tar.xz]

Import statsmodels_0.13.1+dfsg.orig.tar.xz

[dgit import orig statsmodels_0.13.1+dfsg.orig.tar.xz]