Path policy

[MartinKl]

All import modules should link paths in the graph either via absolute paths or paths relative to the runtime directory. Each exporter is then in charge of expressing the path relative to the target directory (or copying and re-linking the files, respectively).

[MartinKl]

Additionally, a graph op could be provided to perform the rewrites of annis::file annotations.

[MartinKl]

This policy could actually be generalized to obliging export modules to define their:

• file handling (e. g., copy linked files)
• path resolution (as a consequence of the first point)

[thomaskrause]

We should consider to make the path not relative to the runtime directory, but to the folder where the TOML configuration file is located.