Made some changes from Mint

Compression.py:
Hastened Calc_DCT()'s creation of the Cosine Transform Matrix
Compression_GPU.py:
Fixed status (Changed status to Unfinished)
Added some import statements
Minor aesthetic change
Debug.py
Temporary changes to assist in debugging GPU code
Decompression.py
Hastened Undo_DCT()'s creation of the Cosine Transform Matrix