Typo in header of shift_stats file

[tleonardi]

Reported by @samir-watson in #132

Hi @tleonardi,

I have had a good look at what was happening with and it seems to a problem with pipes in the fasta headers that are being carried over from the fasta I used during SampComp so when I compare the SampCompDB database to the bed file there is no longer a match.
I will try and redo the alignment with the pipes and extra IDs removed and see if that works.

On another note I found a tiny issue in SampCompDB.py line 421, it says "red_if" and I think its meand to be ref_id.

Cheers,
Samir