genfromtxt skip_footer has problems with comments (Trac #1593)

_Original ticket http://projects.scipy.org/numpy/ticket/1593 on 2010-08-26 by trac user miguel, assigned to unknown._

It seems that genfromtxt's skip_footer parameter in numpy 1.4.1 ignores lines with comments or data with different layout from previous rows.

> > > print np.genfromtxt(StringIO(4_'1 2\n'+3_'12\n'), skip_header=2, skip_footer=3)
> > > []
