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Parser implementation for matrices in UniPROBE format.
The UniPROBE database stores DNA-binding sites as Position-Weight Matrices.
The UniPROBE files contains a metadata line for each matrix, followed by one line per symbol storing tab-separated scores for the column:
Motif XYZ
A: 0.179 0.210 0.182 0.25
C: 0.268 0.218 0.213 0.25
G: 0.383 0.352 0.340 0.25
T: 0.383 0.352 0.340 0.25