Plot: added custom plots for multipl. series
Plot: small code cleanup
Plot: added commentary
Plot: fixed gnuplot error messages

- errors occured when plotting distributions or nodevaluelists of
multiple series with differing amount of batches
- errors occured because gnuplot didnt get any data for the "line" that
was supposed to be in the plot, but actually not existing in the batch
- added a timestamp check so the "lines" wont be initialized in the plot
beforehand, thus gnuplot doesnt expect them and no error will be printed
- also removed the check for "null" batches in the addDataSequentially
method, no null batches should occur in the first place
Plot: added custom nodevaluelist and dist plots
Plot: fixed bug when reading SeriesData with Aggr.
Plot: improved plotting behaviour on miss. batches
Plot: added plot checking and moved code

- plot checking code (including wildcard replacement) moved from
plotting.java to plottingconfig.java
Plot: added plot checking to single series plotting
Plot: commentary added
Plot: fixed a bug with multi series dist-cdf plots
Plot: disabled default value plots on multi series
Plot: added value cdf plots in multiseries plotting
Plot: moved sum-methods from plot to agg-batch
Plot: added *-replace for multiple series (descr.!)

- also removed unnecessary sys.out.println
- added  config commentary
- added utilty method to check if batch contains values
- + some minor code cleanup
Aggr: removed run-"sameType" check
Gen: added generateRuns methods
Plot: added _STYLE flag in custom plot configs

_STYLE can be: lines, dots, points, linespoint, impulses, steps, boxes,
candlesticks, yerrorbars
Plot: fixed bug with math. expression in m.values
Plot: fixed not plotted default metric value plots