User can now input number and unit on same line
v0.2.0-a  ...  Numerous debugging additions (error handlers)
v0.2.0-a  ...  More debugging additions
v0.2.1-a  ...  Fixed bug when a decimal was inputted without a unit; it now throws the correct error message despite length of decimal.  Also, the decimal is now rounded when outputted.
v0.2.3-a  ...  Decimals now are correctly calculated!
v0.2.4-a  ...  If two units are the same, it will not do the calculation now
v0.3.0-a  ...  Can now input scientific notation! Also, if the answer is 1, it cuts of the trailing 's' on the unit
v0.3.2-a  ...  Ability to output in both scientific notation and regular form
v0.3.4-a  ...  Added a restart option in case the user wants to do another calculation
(Fixes #4)