Logging changes in Global Storage state
GS bandwidth usage visualisation -> simple plotting of num readers and writers
GS bandwidth usage visualisation -> simple plotting of current speed
Max bandwidth and max number is now computed
Gantt plotting adjusted to new log format.
Ruby log loader extracted
Bandwidth plotter reads data from parsed log. Log parser now handles storage state logs.
Log parser arguments parsing rewritten. Some refactoring added.
Parser docstring added. Validator example of use added.
Better argument parsing in gantt plotting script.
Resolution as an input  argument for gantt plotter.
Gantt chart cropping ability added.
Storage plotter arg parsing rewritten, added cropping and resolution setting. Added docstring.
Gantt plotter - plotting transfers in workflow mode
Gantt plotter - workflows sorted by priority
Fixed bug with parsing some event. Exponent notation in time diff was not anticipated.
Added more colors to workflow chart. Changed workflow priorities values. Fixed bug with parsing deadline and budget.
Unit tests runner added.
Merge branch 'feature/bandwidth-visualisation'