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This reverts commit 5c8865be.

This reverts commit c388665a.

This should make it easier to identify which log messages come
from these threads.

This should speed up worker startup by 0.5-1.5 seconds.

This should speed up worker startup by about 0.2 seconds.

This should speed up worker startup by about 0.1 seconds.

Speed up imports by up to a second by replacing uses of `pkg_resources`
with the new Python standard library module `importlib.resources` (or,
for Python < 3.7, the backport `importlib_resources`). The old
`pkg_resources` module is known to be slow because it does a lot of
work on startup.

See, for example,
[pypa/setuptools#926](https://github.com/pypa/setuptools/issues/926) and
[pypa/setuptools#510](https://github.com/pypa/setuptools/issues/510).

We are only using Seaborn for configuring styles, and Matplotlib
now ships with Seaborn stylesheets.

Rebased by Leo Singer <leo.singer@ligo.org> to clean up Git history.

Closes !781.

Search pipelines do not report their low frequency cutoffs in a
uniform, machine readable way in the coinc.xml files. BAYESTAR has
been using a default value of 30 Hz. A mismatch in low frequency cutoff
will lead to a systematic bias in luminosity distance.

In O3, search pipelines used the following low frequency cutoffs:

| Pipeline                              | Cutoff                         |
| ------------------------------------- | ------------------------------ |
| gstlal (full bandwidth, stellar mass) | 15 Hz                          |
| gstlal (full bandwidth, IMBH)         | 10 Hz                          |
| gstlal (early warning)                | 10 Hz                          |
| SPIIR                                 | 15 Hz                          |
| PyCBC                                 | 18-30 Hz depending on template |
| MBTA (BNS)                            | 25 Hz                          |
| MBTA (NSBH)                           | 23 Hz                          |
| MBTA (BBH)                            | 21 Hz                          |

15 Hz is a compromise value that is closer to what the pipelines
actually use. A complete solution would be to add an `f_lower`
column to the `sngl_inspiral` table so that pipelines can report
their low frequency cutoffs.

Shikata ga nai.

This reverts commit c1001c14.

This reverts commit 1765eeb6.