Remove tab usage in controller.cpp

- Most of the code in this file uses tabs instead of spaces.
Delete code that obtains the mean fitness of preys

- This code is used to test the assumption that if preys are randomly
  distributed on the lattice, then the mean number of prey neighbors of
  each cell is proportional to the density of the prey species.
Rename class attribute

- mPreyMeanOffspring to mPreyReproductiveCapacity.
- Remove usage of tabs in localcapso.h
Rename class attribute

- mPredatorMeanOffspring to mPredatorReproductiveCapacity.
Rename class method

- setPreyMeanOffspring() to setPreyReproductiveCapacity()
Rename class method

- setPredatorMeanOffspring to setPredatorReproductiveCapacity
Rename class attribute

- mInitialAlivePercentage to mPreyInitialDensity
Rename class method

- setInitialAlivePreys to setPreyInitialDensity
Rename class attribute

- mCompetitionFactor to mPreyCompetitionFactor
Rename class method

- setCompetitionFactor() to setPreyCompetitionFactor()
Rename class method

Apply new naming convention in order to have meaningful code.
Rename class attribute

Follow new naming convention in order to have meaningful code.
Rename class attribute

Follow new naming convention in order to have meaningful code.
Rename class attribute

Attributes related to the predators should be prefixed with 'mPredator'
Rename class attribute

Attribute related to the predators should be prefixed with 'mPredator'
Rename class attributes

Attributes related to the predators should be prefixed with 'mPredator'
Rename class method

Setter methods related to predators should be prefixed with
'setPredator'
Rename class method

Setter methods related to predators should be prefixed with
'setPredator'
Rename class methods

Setter methods related to predators should be prefixed with
'setPredator'
Reorganize some lines that exceed 80 columns