Units and GurobiML removal

Switched from AutomaticUnits package to built-in M10 Units package. Units work fastest when input as `Quantity[1,"Liters"]` (try `Quantity[1,"liters"]//AbsoluteTiming` and `Quantity[1,"Liters"]//AbsoluteTiming`). Units can also be added as `1 Liter` to maintain backwards compatibility with old notebooks. Also, the first time a unit is declared, it will take longer to load. Most units are preloaded in the Units.m file to prevent slow computation during work.

Also removed GurobiML due to incompatibility with M10.0.2