Added new exception class to reveal more information to the user. Fix… #35
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As per discussions, a new class with the default behaviour to show more information to the user about the failed underlying shell command.
Added tests and fixed a small omission on the shell call itself.
Error message syntax can be changed, but for now it is:
Error $CODE: $STDERR\n
Which is pretty similar to the default, just with more information.
Programmatically, if a user is running into a situation where they are causing exceptions, their code should be made to be robust and handle these exceptions. HPCpy is doing what it should and communicating the error through Exceptions, rather than trying to handle them itself, which is going to be a massive can of worms as different HPC platforms have different setups... (i.e. some may not require a queue or project directive at all, where others do, even if there is only one possible option).