Provide icons for the outline-* lfuns.

- Accordingly rename "promote" and "demote" icons.
- Add "outline-down" and "outline-up" icons.

lib/Makefile.am

@@ -420,7 +420,6 @@ dist_images_DATA1X = \
 	images/tab-group-close.png \
 	images/copy.png \
 	images/cut.png \
-	images/demote.png \
 	images/depth-decrement.png \
 	images/depth-increment.png \
 	images/dialog-preferences.png \
@@ -486,8 +485,11 @@ dist_images_DATA1X = \
 	images/nomencl-insert.png \
 	images/note-insert.png \
 	images/note-next.png \
+	images/outline-down.png \
+	images/outline-in.png \
+	images/outline-out.png \
+	images/outline-up.png \
 	images/paste.png \
-	images/promote.png \
 	images/redo.png \
 	images/reload.png \
 	images/script-insert_subscript.png \
@@ -1775,7 +1777,6 @@ dist_imagesclassic_DATA = \
 	images/classic/tab-group-close.png  \
 	images/classic/copy.png  \
 	images/classic/cut.png  \
-	images/classic/demote.png  \
 	images/classic/depth-decrement.png  \
 	images/classic/depth-increment.png  \
 	images/classic/dialog-preferences.png  \
@@ -1839,8 +1840,11 @@ dist_imagesclassic_DATA = \
 	images/classic/nomencl-insert.png  \
 	images/classic/note-insert.png  \
 	images/classic/note-next.png  \
+	images/classic/outline-down.png  \
+	images/classic/outline-in.png  \
+	images/classic/outline-out.png  \
+	images/classic/outline-up.png  \
 	images/classic/paste.png  \
-	images/classic/promote.png  \
 	images/classic/redo.png  \
 	images/classic/reload.png  \
 	images/classic/script-insert_subscript.png  \

src/frontends/qt4/TocWidget.cpp

@@ -52,10 +52,10 @@ TocWidget::TocWidget(GuiView & gui_view, QWidget * parent)
 {
 	setupUi(this);
 
-	moveOutTB->setIcon(QIcon(getPixmap("images/", "promote", "svgz,png")));
-	moveInTB->setIcon(QIcon(getPixmap("images/", "demote", "svgz,png")));
-	moveUpTB->setIcon(QIcon(getPixmap("images/", "up", "svgz,png")));
-	moveDownTB->setIcon(QIcon(getPixmap("images/", "down", "svgz,png")));
+	moveOutTB->setIcon(QIcon(getPixmap("images/", "outline-out", "svgz,png")));
+	moveInTB->setIcon(QIcon(getPixmap("images/", "outline-in", "svgz,png")));
+	moveUpTB->setIcon(QIcon(getPixmap("images/", "outline-up", "svgz,png")));
+	moveDownTB->setIcon(QIcon(getPixmap("images/", "outline-down", "svgz,png")));
 	updateTB->setIcon(QIcon(getPixmap("images/", "reload", "svgz,png")));
 
 	// avoid flickering

src/frontends/qt4/ui/TocUi.ui

@@ -125,7 +125,7 @@
         <string>...</string>
        </property>
        <property name="icon" >
-        <iconset>../../../../lib/images/promote.png</iconset>
+        <iconset>../../../../lib/images/outline-out.png</iconset>
        </property>
        <property name="iconSize" >
         <size>
@@ -144,7 +144,7 @@
         <string>...</string>
        </property>
        <property name="icon" >
-        <iconset>../../../../lib/images/demote.png</iconset>
+        <iconset>../../../../lib/images/outline-in.png</iconset>
        </property>
        <property name="iconSize" >
         <size>
@@ -163,7 +163,7 @@
         <string>...</string>
        </property>
        <property name="icon" >
-        <iconset>../../../../lib/images/down.png</iconset>
+        <iconset>../../../../lib/images/outline-down.png</iconset>
        </property>
        <property name="iconSize" >
         <size>
@@ -182,7 +182,7 @@
         <string>...</string>
        </property>
        <property name="icon" >
-        <iconset>../../../../lib/images/up.png</iconset>
+        <iconset>../../../../lib/images/outline-up.png</iconset>
        </property>
        <property name="iconSize" >
         <size>