Method main
Given 1 argument takes that as the filename, inputs it and dumps the
cell values/types out to sys.out.
given 2 arguments where the second argument is the word "write" and the
first is the filename - writes out a sample (test) spreadsheet
see
HSSFReadWrite.testCreateSampleSheet(String).
given 2 arguments where the first is an input filename and the second
an output filename (not write), attempts to fully read in the
spreadsheet and fully write it out.
given 3 arguments where the first is an input filename and the second an
output filename (not write) and the third is "modify1", attempts to read in the
spreadsheet, deletes rows 0-24, 74-99.