Multiprocessing

Support multiprocessing in TA

Kill ugly global error handler
Speedup with multiprocessing

Close #6

v1.17.0: Remove all cd command

#8

v1.16.0

#5
#7

v1.14.0

Able to update single student's result

Small fix

v1.13.1

Update ta and prevent utf8 error

v1.13.0: Save outputs into given dir without judgement

Add a new argument for storing the program output for creating answer
files or debugging output files. With this argument, the judgement will
be ignored and only run the program with inputs then save these outputs
into given directory.

v1.12.0: Support more platforms

• python 3.7: os.errno
• WSL: file mode

v1.11.0: Improve flexibility of diff command

+ Use 'bash' as the alternative shell to 'sh'
+ Introduce {output} and {answer} to diff command in config file

Close #1

v1.10.0

Cache the log for writing to excel output

v1.9.0: Add return code when exit

In order to work with makefile gracefully, we need a return code to
detect the situation that the student does not get full score and does
not open the verbose option to see the diff result. Therefore, if this
situation happen, the return code will be 1 which can trigger the
command behind "||". There can be a message output to remind user using
the argument to get the diff result.