Release 0.1.4

Library:

* Fixes / updates in functions for computing llh and chi2
* Allow and require output parameters defined in observable table to be defined in parameter table
* Fix merge_preeq_and_sim_pars_condition which incorrectly assumed lists
  instead of dicts
* Update parameter mapping to deal with species and compartments in
  condition table
* Removed `petab.migrations.sbml_observables_to_table`

  For converting older PEtab files to observable table format, use one of the
  previous releases

* Visualization:
  * Fix various issues with get_data_to_plot
  * Fixed various issues with expected presence of optional columns