Better command line input/output management

[holzschu]

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Parsing the command line is done for the most common cases (< input, > output, &> error and 2>&1.

Two things are missing (besides piping, issue #6 and appending, issue #4):

• the ability to enter input on the command line: lua fact.lua <<< "9"
• checking whether 2>&1 is before or after > output. The results are supposed to be different.

See https://en.wikipedia.org/wiki/Redirection_(computing) for detailed description.

[personalizedrefrigerator]

https://github.com/holzschu/a-shell/issues/94 seems related to this!