class DicomInputStream: stop reading on passed Predicate<DicomInputStream>

[gunterze]

Add methods:

...
package org.dcm4che3.io;
...
public class DicomInputStream extends FilterInputStream
...
    public Attributes readDataset(int len, Predicate<DicomInputStream> stopPredicate) throws IOException { ... }

    public void readAttributes(Attributes attrs, int len, Predicate<DicomInputStream> stopPredicate)
            throws IOException { .. }.