remove unused option, simplify %Stats and make PrintStats() more stringent

-v is no longer accepted

we do not need sub hash if we do not use them later

print the header line in PrintStats() to make that function more generic
for patterns.pl too

Signed-off-by: Toralf Förster <toralf.foerster@gmx.de>
sheet: add into R10 a 1 manually, fix typos and column description

Signed-off-by: Toralf Förster <toralf.foerster@gmx.de>
print generic Stats too, clarify and enhance comments

Signed-off-by: Toralf Förster <toralf.foerster@gmx.de>
avoid confusion about examining the empty pattern

before this the empty pattern corresponds to 2^25, now use start/end
values which avoid any confusion

btw prettify more comments and put out the result for the empty pattern
too

Signed-off-by: Toralf Förster <toralf.foerster@gmx.de>