Consider integrating examples as child modules of top level

[haberchr]

Is there a desirable way to abstract some of the common scripts in the examples to the top level of ultk?

pros:

• encourage common patterns of script usage, using top-level scripts as examples
• reduce duplicate files when possible (e.g. basic 'generate_expressions.py', potential scripts for sampling and visualization of results from generations, etc.
• don't need to cd into examples directories for package importing to correctly work
• single config as entry for any script in examples

cons:

• effort involved
  ... etc.