Simple World 1.0 Alpha 4

Simple World tries to reproduce the basic elements that define a simple world. The objective of the Simple World project is to observe the evolution of this world and of the beings that live on it.

System requirements:
- gcc
- cmake
- Boost

Enhancements:
- Update to database version 2.
- Add the field attack_multiplier (a multiplier for the energy of a attack) to the Environment table.
- Remove the unused field energy_developed from the Environment table.
- Add fp (frame pointer) register to help the programmer to use local variables.
- Convert the itp register to cs (control & status) register, which has 16 bits for the itp.
- Rename the stp register to sp.
- Add the directive .ifndef to define a identificator only if if it wasnt already defined.
- Allow the definitions to refer to anything: a number, a instruction, etc.
- Make the jumps of the branch and function operations relative to the pc.
- Add instructions loadhi, callr, bz and bnz.
- Remove innecesary instructions multlu, multlui, divu, divui, modu and modui.
- Change in mutations: replace the permutation of a word by the change of a word.