Add plugins tobe singeleton

	modified:   lib/com.fasterxml.jackson.annotations/META-INF/MANIFEST.MF
	modified:   lib/com.fasterxml.jackson.core/META-INF/MANIFEST.MF
	modified:   lib/com.fasterxml.jackson.databind/META-INF/MANIFEST.MF
	modified:   lib/com.fasterxml.jackson.dataformat.xml/META-INF/MANIFEST.MF
	modified:   lib/net.sf.commonstringutil/META-INF/MANIFEST.MF
	modified:   trace/net.sf.milkfish.product/META-INF/MANIFEST.MF
Add branding images sample

	new file:   trace/net.sf.milkfish.product/icons/alt_about.gif
	new file:   trace/net.sf.milkfish.product/icons/alt_window_16.gif
	new file:   trace/net.sf.milkfish.product/icons/alt_window_32.gif
	modified:   trace/net.sf.milkfish.product/plugin.xml
	modified:   trace/net.sf.milkfish.repository/net.sf.milkfish.product