Added support for <InlineBinary> XML element.

Added preliminary support for the <InlineBinary> XML element, which has been
introduced to the Native DICOM Model with Supplement 163 (Store Over the Web
by Representations State Transfer Services). Currently, data elements with a
VR of OB, OW and UN can be encoded as base64, i.e. OD and OF are still
missing. Partially closes DCMTK Feature #549.
Clarified use of writeXML() flags.

Made more clear which writeXML() flags can be used for which output format.
Fixed typo copied from Supplement 163.

Fixed typo copied from the cover page of the Supplement 163 document
Output a warning message if the VR is unknown.

Output a warning message if the VR of a Tag in the dump file is unknown. This
could happen if the VR is neither specified in the dump file nor it can be
determined from the data dictionary. In such cases, the VR "UN" us used.
Output currently processed line of input file.

Output the number of the currently processed text line of the input file to
the trace logger. This might be useful for debugging purposes.
Merge branch 'master' of http://git.dcmtk.org/dcmtk