This patch adds "Find" entry box to the toolbar to perform case-insensitive search by part of image filename.
Also, there is a new option in preferences to display File Browser toolbar as single row or not. This also solves issue with lower resolution displays.
A new checkbox has been added in the preference window to switch to a "slim" version of the selected theme, for low resolution screens
Curves now uses the theme colors too (was hard to see before with dark themes)
Themes has been named with this convention (of mine, yes) :
[Background ligthness]-[background color]-[Selected items color].gtkrc
Only themes with .gtkrc suffix are now displayed in the combo box
