grand calculator: initial commit.
grand calculator: added Winston WB-LYP100AHA and Winston WB-LYP160AHA
grand calculator: added hyperlinks for Fiat Panda data.
grand calculator: added tire efficiency classes info

also tire -> tyre
grand calculator: WIP

- added an AC motors list
- added headers
- other improvements
grand calculator: added tyre radius calculation.
grand calculator: added flat road power calculations.
grand calculator: added incline power calculations.
grand calculator: added required motor capabilities.
grand calculator: incline -> steep.
grand calculator: snapshotting WIP.