Bug 110331 add tests for import/export
I have written additional tests for import archive, export to file system and export to archive. And changed the import existing and import operation (file system) tests. This work required a change to the TarFile class in the ide plugin. Attachments to follow.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/TarFile.java
private File file;
	private TarInputStream entryEnumerationStream;
	private TarEntry curEntry;
	private TarInputStream entryStream;
	/**
	 * Create a new TarFile for the given file.