[Enhancement]: Searches/VL enhancements

[Mi Ro]

This enhancement could be for both, GUI and web, interface.

1. Assign picture to searches, so each search will be represented by specific picture. The picture could be either user selected from filesystem or generated similarly to cover generating function.
2. Implement new view layout similar to "cover grid" for searches ("search grid"). The search grid will be for actual virtual library. By clicking the cover picture of particular search, the new TAB with such search will open.
3. each search could have attribute to include in "search grid" or not. Or simply search without defined picture will be excluded from search grid.
4. do/don' display searches with zero results in the search grid
5. include search count result in the search grid below the picture

Example usage:
- I will create searches for all book related to authors Jules Verne, Victor Hugo, Agatha Christie ...
- I will assign photo of each author to the particular search
- I will turn the view to "Search Grid" so I will see nice pictures of writers, with search string (actually the name of author) and number of books

OR
- I will do the searches for each alphabet letter(to show all authors, books or whatever starting with such letter) and assign alphabet pictures to them. So I can nicely view and pick what I am looking for in graphical form.

OR
by searching in TAGs, the thematic group of searches can be made represented by picture.

This is also more or less extension to Virtual libraries, so list of them can be shown in user friendly grid view represented by the picture.