[test] Use --short-description when testing newcube command

[devtools] Allow to specify short desc on `newcube` command line In order to implement automated testing of `cubicweb-ctl newcube`, we need to avoid any user interaction. So we add a `-s` switch to specify a short description on the command-line instead of requiring an input.

[pkg] Remove build dependency on dh-systemd As suggested by Lintian, remove build dependency on obsolete package dh-systemd. Instead, specify a more precise version of debhelper 9 that added support for systemd.

[config] Raise in case of failure to send emails when in test mode Since, for some reason, exception log messages are not visible when running tests, it's very hard to debug when sendmails() method fails during tests. So, as in some other places, let's raise the exception when in test mode.

[doc] Update documentation to match current Debian packages

[pkg] Remove transitional packages We can take the opportunity of the switch to Python 3 to get rid of old transitional packages. Let's do it. :)

[pkg] Use sections from requires.txt to populate Recommends and Suggests As Denis Laxalde pointed out, dh_python can also generate Recommends and Suggests from Python package names. So let's use that instead of manually populating these fields in `debian/control`. Optional dependencies are currently specified in `setup.py` grouped by feature. These dependency groups are turned into sections in `requires.txt`. Thankfully `dh_python3` has options to populate Recommends or Suggests with all package from a given section. `debian/rules` now contains a list of which sections should go to Recommends and which section should go to Suggests. Because such extra list easily gets out-of-sync, we add a third list for ignored sections, and ensure that all sections currently in `requires.txt` get a mentioned in `debian/rules`. Here are the results compared to the previous version with explicit Recommends and Suggests (only listing Python packages): |==============================================================| | only in previous | common | only in new | |==============================================================| | Recommends | |--------------------------------------------------------------| | | python3-docutils | | | python3-fyzz | | | | python3-imaging | | | | | python3-pycryptodome | | | | python3-pyramid | | | | python3-pyramid-multiauth | | | python3-pysqlite2 | | | | | python3-rdflib | | | | python3-repoze.lru | | | python3-simpletal | | | | | python3-vobject | | | | python3-waitress | | | python3-werkzeug | | | | | python3-wsgicors | | |--------------------------------------------------------------| | Suggests | |--------------------------------------------------------------| | | | python3-pil | We also lose versioned dependencies which should not really be an issue for Recommends and Suggests.

[crypto] Use Cryptodome namespace instead of Crypto PyCryptodome comes in two flavors: “an almost drop-in replacement for the old PyCrypto library” and “a library independent of the old PyCrypto”. The former uses the Crypto namespace, and is shipped as `pycryptodome` while the latter uses Cryptodome instead and lies in the `pycryptodomex` package. Given the reason to switch to PyCryptodome is that PyCrypto in unmaintained, its probably better to avoid any mistake and mandate the specific usage of the Cryptodome namespace by requiring `pycryptodomex` instead of `pycryptodome`. A more present reason is that Debian buster will only provide a package with the separate namespace flavor. The current Recommends is not working with the current code. Although it's important to note that the package name will probably have to be changed to `python3-pycryptodomex` once https://bugs.debian.org/886291 is solved.