[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.

[pkg] Remove python3-six from Build-Depends The default branch only provides support for Python 3.

[pkg] Merge python3-cubicweb-pyramid into python3-cubicweb As suggested by Denis Laxalde, we can merge python3-cubicweb-pyramid into python3-cubicweb as all other web backend in the default branch.

[pkg] Remove explicit Depends on Python packages for python3-cubicweb As suggested by Denis Laxalde, we can let pybuild generate the list of Depends from the egg requirements. The list we get is slightly less specific in terms of needed versions, but given the age of the previous ones, it's unlikely to cause issues. Also we lose python3-six from the list… which is correct as it was removed from the dependencies in 26744ad37953.

[pkg] Fix spelling mistake in doc-base abstract

[pkg] Fix doc-base section As pointed by Lintian, the “Apps” section is only used in menu, not in doc-base. We can just remove it.

[pkg] Use “dependency package” instead of “virtual package” to describe python3-cubicweb-postgresql-support The term “virtual” was too imprecise and is not accepted for empty packages by Lintian anymore.