Clean code in install

[luanluciano93]

Hello Gesior could simplify this code:
https://github.com/gesior/Gesior2012/blob/TFS-1.0/install.php#L18-L52

that is why:
include_once('./system/load.init.php');

https://github.com/gesior/Gesior2012/blob/TFS-1.0/install.php#L145-L179
that is why:
include_once('./system/load.database.php');

among other things ..

[gesior]

If someone got a minute:

1. change it
2. test if installer still works
3. make pull request

Refactoring in Gesior is around.. zero, so these lines is not a big problem.