Added control structure to deal with multiple probes per contig

Exploring the data in R has revealed that most contigs have more
than 1 probe and comparing to make sure that all the revcom contigs
are different from the forward contigs is easier for me in perl
than R.
Testing hash of arrays formation

Turns out I didn't really need all of that control structure
from the previous commit because perl is clever and will
create a new key if one doesn't exist and make a new array to
keep my probes in.

Also added some Dumper code so that I could check that the hash
of arrays contained what I expected as I expect it to.
Found a way to check if the probes are the same

Decided to use Array::Utils to find if there are any diferences
between the two arrays of probes. By checking if the symmetrical
difference exists I can put the ones with the same probes into
one array and the ones without into another.

Only one problem - have one less different than the number
of contigs.