Making DPS a python package

[kreczko]

Summary

• moved all code to dps folder
  • config → dps.config
    • config.XSectionConfig → dps.config.xsection.XSectionConfig
  • condor → dps.condor
  • examples → dps.examples
  • experimental → dps.experimental
  • legacy → dps.legacy
  • src → dps.analysis
  • tools → dps.utils
• updated all (?) import statements and paths
  • needs testing (running the usual scripts)
    • implement ntp run dps where=local|DICE
• added setup.py
  • added requirements
  • added to tests

MISC

I noticed that a few files (old scripts) are broken due to missing variables (fit_var_* and bin_edges) and marked them with the @BROKEN tag (grep -rI "@BROKEN" . to see them)

[kreczko]

Based on the feedback, there are still a few things to do.
Most importantly it would be useful for testing to create an NTP branch where this PR is integrated.
i.e. ntp run dps where=local|DICE