add verbose argument to some routines
update parameters section in docstrings (verbose argument etc.)
new ProblemConf.update_conf(), .add_missing()
selective equations evaluation - new ProblemDefinition.eval_equations()

- update eval_equations(), Equations.evaluate() - add names argument
update Equations.evaluate() - split weak branch, fix/update docstring
fix link in docstring of ProblemDefinition.update_materials()
update parsing lexical elements of problem configuration

- new list_dict()
update word_free definition
add verbosity argument to FieldVariable.evaluate_at()
update docstrings (verbose argument)
remove kill_* shell scripts