Bug 32893 Workspace Compatibility Problems 2.0 -> 2.1
Build 2.1 RC1 This PR collects problems related to opening a 2.0 workspace with 2.1.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/PreferenceConstants.java
* <p>
	 * Value is of type <code>Boolean</code>: if <code>true</code> return types
	 * are rendered
	 * </p>
	 */
	public static final String APPEARANCE_METHOD_RETURNTYPE= "org.eclipse.jdt.ui.methodreturntype";
	/**
	 * A named preference that controls if override indicators are rendered in the UI.
	 * <p>
	 * Value is of type <code>Boolean</code>: if <code>true</code> override 
	 * indicators are rendered
	 * </p>
	 */
	public static final String APPEARANCE_OVERRIDE_INDICATOR= "org.eclipse.jdt.ui.overrideindicator";
	/**
	 * A named preference that defines the pattern used for package name compression.
	 * <p>
	 * Value is of type <code>String</code>. For example foe the given package name 'org.eclipse.jdt' pattern
	 * '.' will compress it to '..jdt', '1~' to 'o~.e~.jdt'.
	 * </p>
	 */	
	public static final String APPEARANCE_PKG_NAME_PATTERN_FOR_PKG_VIEW= "PackagesView.pkgNamePatternForPackagesView";
	/**
	 * A named preference that controls if package name compression is turned on or off.
	 * <p>
	 * Value is of type <code>Boolean</code>.
	 * </p>
	 * 
	 * @see #APPEARANCE_PKG_NAME_PATTERN_FOR_PKG_VIEW
	 */