Bug 151361 default value for reousrce folder user preference
When user does not sepecify the resourec foler user preference, can we make the current project folder (in IDE) or the current report design file's folder (in RCP) as the default value for the resource folder. This way, by default the current project folder is the resource folder where user can create their libs and images. Also please set the default user preference to be null when BIRT is freshly installed.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/ReportPlugin.java
*            the string of element names
	 */
	public void setDefaultNamePreference( String element )
	{
		getPreferenceStore( ).setValue( DEFAULT_NAME_PREFERENCE, element );
	}
	/**
	 * Set default names for the element names from String[]
	 * 
	 * @param elements
	 *            the array of default names
	 */
	public void setCustomNamePreference( String[] elements )
	{
		getPreferenceStore( ).setValue( CUSTOM_NAME_PREFERENCE,
				convertStrArray2Str( elements ) );
	}
	/**
	 * Set default names for the element names from String
	 * 
	 * @param element
	 *            the string of default names
	 */
	public void setCustomNamePreference( String element )
	{
		getPreferenceStore( ).setValue( CUSTOM_NAME_PREFERENCE, element );
	}
	/**
	 * Set descriptions for the element names from String[]
	 *