Added fp_oversample

fp_tools-v0.3.0

Small fix

Bug fixed

Bug reported from Philippe Amram was fixed. His texts follows:

Please check CRPIXEL3 
Before adding a FSR  I read CRPIXEL3 =1
Adding a FSR (40 channels), I read CRPIXEL3 =42
Cutting 20 channels, I read CRPIXEL3 =22
Maybe it should be 1, 41 and 21 respectively ?

fp_cut and fp_repeat working

0.2.2

Updated README.md