Add sumbit answer problem support

[q234rty]

Don't seem to be covered by #38

[twd2]

Could you please explain in more detail? The format, ...

[q234rty]

Given all input files,one should submit all output files.

[iceboy233]

This should be implemented as submitting code as "raw output", i.e. the submitted code is used as output; and one needs to submit different code for each data point.

[twd2]

Interpreter: cat