Baseline correction transformer needed

[Ryan-Bringenberg]

The transformer should take in a DataFrame or text file and substrate the baseline out from the remaining data points.

Example data:

<style> </style>

concentration	rate
0	0.841
1	1.025
2	1.11
4	1.243
8	1.29
16	1.53
32	1.335
After transformation
0	0
1	0.184
2	0.269
4	0.402
8	0.449
16	0.689
32	0.494