bnc#801152: Scan all columns to determine the first data row.
bnc#801152: Scan all columns to determine the first data row.

When scanning the entire data range in an attempt to determine where
the first data row is, we shouldn't stop at the first column.  We should
scan all data columns to make sure we pick the lowest value row
position among all columns.

Change-Id: I693ec169857b181c6b4237efcba3fa6a46eaa531

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core