Removing an old script. This originally was a test of the encoder/decoder functions. It has been replaced by the qa scripts in gr-ldpc/python directory. However, the part of this script that systematically introduces errors and validates correct decoding is not really replicated in a qa script. To do that, I plan to introduce a channel block into one of the qa scripts. Regardless, this script is outdated, using old function calls, so it's being deleted.