add: construction from matrices (e.g. float[][]) and method toMatrix()

...ource/java/ch/systemsx/cisd/common/array/MDByteArray.java

...rce/java/ch/systemsx/cisd/common/array/MDDoubleArray.java

...urce/java/ch/systemsx/cisd/common/array/MDFloatArray.java

...source/java/ch/systemsx/cisd/common/array/MDIntArray.java

...ource/java/ch/systemsx/cisd/common/array/MDLongArray.java

...urce/java/ch/systemsx/cisd/common/array/MDShortArray.java

...eTest/java/ch/systemsx/cisd/common/array/MDArraytest.java