[svn r7090] -- add offset param for add() -- fix in offsetSet -- simplify offsetExist
[svn r7090] -- add offset param for add()
-- fix in offsetSet
-- simplify offsetExist

--HG--
branch : trunk

limb-php-framework/limb,limb-php-framework/limb,AlexMarlo/limb,anoam/limb,AlexMarlo/limb,limb-php-framework/limb,AlexMarlo/limb,anoam/limb,anoam/limb,limb-php-framework/limb,limb-php-framework/limb-cms,anoam/limb,anoam/limb,limb-php-framework/limb-cms,anoam/limb,limb-php-framework/limb