Allias engine API, User balance, comment images

+ New allias for fast access to all classes of our system - engine. As
exmpl u can use $engine->class_name->method() without importing links to
all classes
+ Added logging in user balance. Added displaying in front with config
in back
+ Fix bug with uploading images in comment area with size more then
max_allowed.
/+ All classes in system are optimized to newest model - $enigne->class.