runme.sh now runs for multiple usages, details listed in description

Usage:
    1. sh runme.sh
    2. sh sunme.sh testFile.in
Note:
    1. If no argument is supplied, the program will search for .in
files in the current directory and run fuscm.py for every test file;
    2. If the program cannot find any test files when no argument is
supplied, it will promote user to type inputs.