give user an estimate or runtime and disk space used by output files

[Vincent Voelz]

give user an estimate or runtime and disk space used by output files! --VInce

upodate: PYEMMA has a nice progress bar that maybe we can use

[Yunhui Ge]

Do you mean develop an equation to compute this based on what we have so far or find/write some functions to compute that in our scripts? @vvoelz