2nd Version

Changes:
1. The input is the STANDARD EQUALITY FORM
2. Should provide the RHS VALUE OF ROW #0
3. For the Big-M method, should cancell out the BASIC VARIABLES'
coefficients containing "M"
Fixed Bugs:
1. Keep the RHS value always POSITIVE, so we can judge which row should
be pivoted just using LFS value
2. Repair the bug that the program cannot start-up when dealing with
Big-M method