[PATCH] Syntax: Added syntax for Python decorators.

[matteo_luigi_raso]

Decorators are an important part of the Python language, so GNU nano should

give them a colour instead of ignoring them. For the syntax, I start the

colouring at "@" and end it at either a blank space or a newline. The

reason I stop the syntax after a blank space is because "@" doubles as an

operator in Numpy and downstream packages, so we have to take care to not

mess up the entire line if "@" is used that way. One slight problem is that

the syntax colouring will also apply to any arguments passed to the decorator

if a space isn't placed between the opening bracket and the decorator.

e.g. "@dec(a)" will be one colour, which might be slightly unaesthetic.

This isn't much of a problem though, since it can be easily fixed by going

"@dec (a)"

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