Updated documentation.
Restored creation of admin account.

But with randomized password.
It's quite useful to have the system create an admin account by default.
By using a randomized password it cannot be used straight away though;
the user needs to use the "cypasswd" command on the server machine to
alter the password to something useful.
Updated documentation.
Only drop fruits if the plant is adult.

This to some degree fixes issues with too many plants, as even new
plants spawned fruits.