GTH_SOLVE: Add gth_solve.jl
GTH_SOLVE: Add test_gth_solve.jl
GTH_SOLVE: Include test_gth_solve.jl in runtests.jl
Minor correction
Comment corrected
Correction
Comment added
GTH_SOLVE: Returns the output of the same type as the input matrix
GTH_SOLVE: Handles input with elements of Int type
Message modified
Type matching improved
Test for rational numbers added
Merge pull request #23 from oyamad/gth_solve

Implement the GTH algorithm