Read input file without running simulation

[yangbai90]

Instead of running the simulation immediately, we need args from the command line to allow users to read their input file only. Thus, we can verify the input data easily.

[yangbai90]

Now, users can use the --read-only command:

asfem -i youinput.i --read-only

The detailed changes can be found here 455e5a153f92bf511b5b34d24f008263e6175b54