Unit-ship:Doctor

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Description
These doctors have voluntarily enlisted to help tend to the wounds of those on the battle front. They can remove arrow heads, bandage up sword wounds and have enough ice available for soldiers' heads should enemies attack with slingshots. __NOWYSIWYG__


 * Doctors are very useful for restoring the lost hit points of your Human units during battle.
 * However, they can not heal any of the Machine units you may have.
 * Each Doctor can heal exactly 200 hit points each round of a battle to your injured units.
 * Healing can be done to multiple units.
 * Healing occurs at the beginning of each combat round.
 * Dead units can not be healed by Doctors.
 * During battle, Doctors deploy in the reserve slots, out of the main battle lines.
 * As Doctors deploy out of the main battle lines, they never use their weapons, and cannot be killed either.
 * Doctors do not move to the front battle line if not filled, so if you have no units except Doctors or other auxiliary units in a battle, they will withdraw.
 * You can place unlimited Doctors on the battlefield.
 * This means that their size of 1 has no meaning for the battlefield.
 * Their size of 1 is meaningful only when they are being transported by Cargo Ship.
 * Doctors do not receive any upgrades from the Workshop.

Training times
$$Training \ time \ = \left \lceil Base \ time \times 0.95 ^ {n - n_0} \right \rceil$$
 * where :
 * Training time : The calculated time (in seconds) needed to train the specific unit on the nth Barracks' level.
 * Base time : The time (in senonds) needed to train the specific unit on the Barracks' first level that the specific unit can be trained [ for this unit 20 minutes = 1,200 seconds ].
 * n : The nth Barracks' level.
 * n0 : The Barracks' first level where the specific unit can be trained [ for this unit is the  Level ].

1 - 10 = 11 - 20 = 21 - 30 = 31 - 40 = 41 - 50 = 51 - 54 =

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