Refactor grid package

Update classes to use isGpuEquipped method

A comprehensive review and improvement of the entire project documentation

The documentation was updated in subclasses that effectively had any difference from the inherited class/interface.
In these cases, the tag {@inheritDoc} was used to extend the documentation in the subclass and avoid documentation duplication.

This was the last package updated from the 12 CloudSim packages.

Removed '(non-Javadoc)' comments of methods. These comments were used in overloaded methods, but
in fact, they don’t help in anything. They weren’t in javadoc format and have no effect.
And after all, when there isn't a javadoc in an overloaded method, the javadoc of the method in the 
super class is shown.

Inserted links to papers cited in several classes.

Documentation of packages org.cloudbus.cloudsim.network and org.cloudbus.cloudsim.power.lists improved.

Included some @todo's suggesting the assessment of some methods used to find an object inside a List in order to reduce search time. One option is to change some List objects by a HashMap. Other details can be seen at the @todo's inside the source code.

Included some @todo's suggesting the assessment of some methods used to find an object inside a List in order to reduce search time. One option is to change some List objects by a HashMap. Other details can be seen at the @todo's inside the source code.

It was made clear that the classes are generators of pseudo random numbers following a given distribution.
A link to the distribution's Wikipedia page was included for each class.