Handle parser-guess-case of broken 1st few lines

smalldata/unbalanced/orange_small_xxx.data.zip broken in both parser1
and parser2, because the shared parser-guess-setup was losing it when
1st two rows are clearly unequal.  This file is tab-separated, with 230
labels on 1st row, and 224 cols on the 2nd row... and most rows are
missing the last several calls (but not all).  Real mess to parse, but
with this change we get "as clean as is reasnable" on this data
One more bit