TimeDistrib tile - get rid of config's fcrit & flimit args

[tomachalek]

... and use customApiArgs instead. The loses in typing accuracy can be compensated using sanityCheck() function which can validate tile's configuration based on "itself":

e.g. if the sanityCheck() function finds out that its using mquery api, then it should look for customApiArgs and test whether all the needed args are there. The same applies for KonText api.