Implemented most of the LU algo with complete pivoting. Will do the rest tomorrow.
Currently it compiles but don't run it!

Implemented function to find the entry of a matrix that has biggest absolute value, ignoring a given number of rows and columns (used by LU algorithm)

Implemented isNegligible function to help determine when a floating-point number can be considered negligible in comparison with another one. This is a classical workaround for the strangeness of operator== for floating-point numbers.

Added myself to the copyright lines of kmatrixn.h