Correctly adhere to serialization directives for file generation

[neeohw]

The file generator doesn't adhere to the filenames in the serialization directives. Which renders the URL's useless as the files won't exist. This PR fixes that.

[dgarijo]

Thanks for your contribution.
I am not very sure of which problem does this PR address. Can you please explain or provide an example?
The serializations are always the same, initialized in the Configuration of the program.
Thanks in advance

[neeohw]

The generator generates serializations with hardcoded file names, but the configuration file allows for indicating the url of the serialization and also the file names. I wanted to make sure that the serializer adheres to these file names if they are configured explicitly. (Which is also what we want in our document generation pipeline.) If it shouldn't be changed here I would like to know what the right procedure is to make sure the serializations can have other file names or aren't generated at all ...

[dgarijo]

Thanks for the explanation, that makes sense :)