Add a simple model for spot location and MALDI target ID

[Mailaender]

There is more to model here as depicted in

chemclipse/chemclipse/plugins/org.eclipse.chemclipse.msd.converter.supplier.mzxml/src/org/eclipse/chemclipse/msd/converter/supplier/mzxml/internal/v32/model/Plate.java

Lines 30 to 45 in 5fb21c5

	@XmlElement(required = true)
	private OntologyEntry plateManufacturer;
	@XmlElement(required = true)
	private OntologyEntry plateModel;
	private Pattern pattern;
	@XmlElement(required = true)
	private List<Spot> spot;
	@XmlAttribute(name = "plateID", required = true)
	@XmlSchemaType(name = "positiveInteger")
	private BigInteger plateID;
	@XmlAttribute(name = "spotXCount", required = true)
	@XmlSchemaType(name = "positiveInteger")
	private BigInteger spotXCount;
	@XmlAttribute(name = "spotYCount", required = true)
	@XmlSchemaType(name = "positiveInteger")
	private BigInteger spotYCount;

but spot/plate as text seems to be the common denominator between all the MALDI formats.

There is also overlap between microplates, which could be addressed in the future.