[IMP] mrp: more explicit labels for "BoM type"
[REM] mrp: removal of group_route_line_type

This group was used only to hide/display the type (normal or phantom) of BoM lines.
Adding a group to hide/display 1 field seems overkill.
[FIX] product_extended: incorrect inheritance

This view was intended to extend the tree view of mrp.bom, not
mrp.bom.line. Nonetheless, the view mrp.mrp_bom_tree_view which is extended here is a
view for a mrp.bom.line, and there is no tree view for a mrp.bom.

So this extension has no meaning anymore and seems to have worked only
by accident...
[FIX] web: form rendering: use attr in attach_node_attr