…om the main Makefiles.

…s. Autogeneration should now be a lot more transparent.

This was achieved by tweaking `doc/source/conf.py`.

This triggered a few cascading changes:
1. I needed to rename `config/query-version.py` to `config/query_version.py` so that it's contents could be properly imported
2. I needed to slightly tweak the internals of `config/query_version.py` so that the function returned values (instead of directly printing the value). To reflect this change in behavior, I changed a function name from `show_version` to `query_version`
3. While doing this, I also fixed a bug in some functionality from `config/query_version.py` that was intended to strip off a trailing '\n' character from the result of a shell command. In some cases, a trailing line-break might not be present and the functionality accidentally striped off a different character instead.
4. I needed to adjust a path in `src/clib/Makefile` to reflect the new name of the `config/query_version.py` script

Previously, `LIB_RELEASE_VERSION` was defined in `src/clib/Make.config.assemble`.
- This was fine, when `LIB_RELEASE_VERSION` was assigned a hardcoded value
- however, after we started to use a script to retrieve this value, error messages were printed whenever we invoked the `src/example/Makefile` (to build code-examples)
- The error messages arise because the path to the script was encoded within the `QUERY_VERSION` variable and that variable was not defined when `src/example/Makefile` included `src/clib/Make.config.assemble`
- Since script-path is only defined within `src/clib/Makefile` I decided to move the definition of `LIB_RELEASE_VERSION` to that file.

NOTE: since the `LIB_RELEASE_VERSION` wasn't actually used by `src/example/Makefile` the error-messages before this commit were entirely benign.

The required logic to fetch the last line of the file is now implemented in python. The logic loops over all lines from the VERSION file (from beginning to end) and returns the final non-empty line. This is fine for the VERSION file which should really just be 1 line (but is suboptimal for large files)