Add property decorators in World

[ftomassetti]

For example:

@property
def elevation:
    return self.layers['elevation'].data

[tcld]

It might not hurt if you added this to #207, if you could spare the time. By "add" I mean "create all necessary functions and then replace every use of any layer throughout the code with a call to the corresponding property".

Also, do you need to explicitly create a setter, too?

@property
def elevation(self):
    return self.layers['elevation'].data

@elevation.setter
def elevation(self, value):
    self.layers['elevation'].data = value

[ftomassetti]

Me and Bret discussed it and we would prefer to go by steps: so we first merge #207 and then introduce property decorators. I am not sure about the setters perhaps it could make sense given we had all those set_ocean, set_temperature methods to replace

[psi29a]

Thanks for this @tcld it is good plan. :)

[Himura2la]

I'm going to convert to properties all functions that starts with set_ in Setters section.