* UI tweaks, fixes, updates for the affected files.

* New horizontal tab

This was SVN commit r3655.

binaries/data/mods/official/gui/test/sprite1.xml

@@ -1680,7 +1680,7 @@
 				/>
 		</sprite>
 		<sprite	name="snIconSheetCommandOver">
-				<image	texture="session/icons/sheets/command_o.dds"
+				<image	texture="session/icons/sheets/command.dds"
 						cell_size="64 64"
 						size="0 0 100% 100%"
 				/>
@@ -1706,7 +1706,7 @@
 				<image	texture="session/icons/bkg/command.dds"
 						size="0 0 100% 100%" 
 				/>				
-				<image	texture="session/icons/sheets/command_o.dds"
+				<image	texture="session/icons/sheets/command.dds"
 						cell_size="64 64"
 						size="0 0 100% 100%"
 				/>