Nightly debian packages and other GitLab-CI/Docker improvements

Closes #61 and #62

See merge request !271

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now that packages are built nightly and containers are created nightly
using these packages there is no need for the older containers built
from source, along with the nightly parallelised Stretch and EL7 builds
as the Deb and RPM builds test Stretch and EL7 respsectively.

mark these with FIXME comments for future removal.

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this ensures the docker containers are built before the artifacts from
dependent stages are removed

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Co-authored-by: Leo Singer <leo.singer@ligo.org>

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removes NMU warnings from Lintian

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Further debian packaging fixes

See merge request !314

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also ensure packages are name correctly

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also ensure packages are named correctly

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also ensure packages are named correctly

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also ensure packages are named correctly

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also ensure packages are named correctly

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also ensure packages are named correctly

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More debian packaging fixes

See merge request !313

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workaround automake not cleaning up __pycache__

See merge request !312

this seems to be a bug in automake, and the automake developers agree.
whilst we work with them to correctly cleanup these files remove these
files using the clean-local target

Use assert_allclose to compare floats in lalburst/test

See merge request !311

this fixes the current `make check` issue on python3

Debian packaging fixes

See merge request !310

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Debian fixes

See merge request !308

Deploy binary executables in wheels

See merge request !164