Remove cwin from set style view options..
First effoct to gobjectify PraghaLibraryPane. 
Only work append, replace and replace & play options.. =)
D'Oh!.. =)
Renable rename, remove and export..
Renable edit tags from library pane.
Renable delete from hdd and db..
Renable change style of library view..
Remove PraghaWindow. Complicating more than it solves..
TODO: From now on, functions as pragha_window_*  refer to widgets, and pragha_aplication_ * to intancias as preferences, or database.
Use always pragha_window_get_mainwindow (cwin);
Use always pragha_window_get_pixbuf_app(cwin);
Remove old function prototype..
Always use pragha_application_get_backend (cwin);
Use Backend pointer of callbacks..
Private menu_ui_manager a bit..