TODO.library

After 0.99:
DONE returning from footnotes (ask if footnote is in the same model and there was page scrolling)
* prevent from sleep if battery is in charging mode
* Open the help file if the current book is deleted from library
DONE Partial loading from database
* Database updating in backgorund
* Watch filesystem after loading
DONE Show wait message during search
* Reload book info for all the files
* garbage in Boris Akunin, Сказки для идиотов


** A problem in UI:
	1. Select any footnote link by trackball movement (selection border will be shown);
	2. Open selected footnote by trackball click;
	3. Close opened footnote by "Back" key press;
	problem: selection isn't displayed;
	description: selection of footnote link will never be shown until any other link will be selected.