Update list for iSudoku
Fixed a few bugs in the program.
1.The following techniques were added for solving and generating puzzles: Unique Rectangle (Type 1 - 6) Hidden Rectangle Avoidable Rectangle (Type 1 - 2) W-Wing Remote Pair X-Chain XY-Chain Discontinuous Nice Loop Continuous Nice Loop Alternate Inference Chain (Type 1 - 2) 2. Added printer support.
1. Two new techniques are added for solving and generating puzzles. 2. Reconstructed the software for easy upgrade.