* Add tut4.cpp: tree structure stored in a table. Fixes to make it work. * Fixes to build under MacOSX. * Refactor Engine classes hierarchy. * Refactor methods Engine::insert(), Engine::update(), Engine::delete(). * Implement OrderedDict class template. * Fix finding tables and columns by name, improve speed. * Set FK value on linking of two objects if posible. * Add distinct and for update flags to SelectExpr. * Extended logging for delete_object() operation. * DDL statements generated from Schema are now iterable. * Rename class Filter -> Expression. * Rename some files to follow common style and to better reflect their contents. * Fix per request from nbuyvich: chained property references. * Fix delete_object() to behave properly when deleting a row from a link-table (n-to-n relation). * Fix yborm_gen: default value setter. * Fix per request from nbuyvich: Make it work: pg1->parent->id.is_null()
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