Data loader and RFI filter

[vivekvenkris]

Here is the general idea for the preprocessing of data before sending it to the GPU.

The data in TAFTP ordered DADA format files need to be

1. loaded on RAM
2. detected, and passed to a Kurtosis filter to obtain a mask
3. Apply the mask to produce clean TAFTP ordered data
4. Send this clean data to the GPU