BF: only accepts classes that have extraInfo and runParams

ENH: exp_choices can be len 1 which means a path is given
BF: aggregate works properly with None rows or cols
BF: should now work if after errorbar computation a series appears
multiple new things and fixes!

ENH: fixation has a clever setColor method
RF: trial is expected to have 'func', not 'defaultFun'
RF: waitEvent -> idle_event, postTrial -> post_trial
ENH: trial display does not need to be a list anymore
NF: feedback can be provided
RF: set_autorun is done now in setup
RF: genPara and genParaNo finally removed
NF: GroupStim for grouping together stuff
ENH: demos organized in a typical project manner and working!

RF: main exp changed into confsup
ENH: updated instructions how to run