Handle mutable `lag_time` wrt ergodic_cutoff
Handle mutable `lag_time` wrt ergodic_cutoff

fixes #617

Calculate the numerical value of minimum number of counts required for a
"connection" when fit() is called; not when the estimatior is
initialized.

rafwiewiora/msmbuilder,rafwiewiora/msmbuilder,mpharrigan/mixtape,cxhernandez/msmbuilder,Eigenstate/msmbuilder,dr-nate/msmbuilder,Eigenstate/msmbuilder,rafwiewiora/msmbuilder,msmbuilder/msmbuilder,stephenliu1989/msmbuilder,Eigenstate/msmbuilder,msmbuilder/msmbuilder,mpharrigan/mixtape,msmbuilder/msmbuilder,rafwiewiora/msmbuilder,brookehus/msmbuilder,brookehus/msmbuilder,msultan/msmbuilder,msultan/msmbuilder,cxhernandez/msmbuilder,rmcgibbo/msmbuilder,msmbuilder/msmbuilder,mpharrigan/mixtape,rafwiewiora/msmbuilder,rmcgibbo/msmbuilder,brookehus/msmbuilder,msmbuilder/msmbuilder,dr-nate/msmbuilder,Eigenstate/msmbuilder,dr-nate/msmbuilder,peastman/msmbuilder,cxhernandez/msmbuilder,peastman/msmbuilder,cxhernandez/msmbuilder,msultan/msmbuilder,rmcgibbo/msmbuilder,dr-nate/msmbuilder,Eigenstate/msmbuilder,dr-nate/msmbuilder,peastman/msmbuilder,msultan/msmbuilder,stephenliu1989/msmbuilder,peastman/msmbuilder,stephenliu1989/msmbuilder,msultan/msmbuilder,mpharrigan/mixtape,brookehus/msmbuilder,cxhernandez/msmbuilder,rmcgibbo/msmbuilder,mpharrigan/mixtape,stephenliu1989/msmbuilder,brookehus/msmbuilder,peastman/msmbuilder