Sort grammar rewrite and bugfix with multiple fields #65
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Fixes #49 and #64 .
Rewrote sort command's grammar to allow multiple fields with a comma delimiter.
Grammar was refactored because it didn't support having the optional parameters anywhere in the query. So, the main change is the main grammar rule in sort which now allows having the parameters in any order and as many times as wanted. Now it is more or less left for PTH-10 to check that the parameters are given just once etc.
Added a new grammar rule for the plus sign: differentiated it from the minus for easier visiting in PTH-10.
Wrote unit tests for sort command, there weren't any before.