REFACTOR: #16,  #1: refactor Trace with Std

* uses now argparse
* easier up interface
* plots std also on logscale
REFACTOR: #1 use one method to load data for plotting
REFACTOR: #16,  #1: refactor TimeTrace

    + is now called plotOptimizerOverhead to clarify
    * uses now argparse
    * easier interface
    * plots std on logscale
    * uses plot_util
FIX: imports
ADD: #1: add plotTraceWithStd_perTime.py
FIX: forgot file
Merge branch 'development' of https://github.com/automl/HPOlib into development