Adding documentation and PHPDoc headers on files
Setting up @deprecated info for the error class
Setting up the HappyField class. Need a unit tests class
Adding unit tests for the HappyField class and fix some bugs (thks to unit tests)
adding new tests and a new validation system.
+ Adding a [sameThat] method to compare a field with another.
adding support of global defined functions
adding support of global defined functions (part2)
Fixing a test result for the decimals