Updated "dcmrt" classes based on DICOM 2014b.

Updated automatically generated IOD and sequence c++ classes for the various
RT objects based on the current edition of the DICOM standard (2014b). This
time, the official DocBook/XML version has been be used (previously, it was
an unofficial version of the DICOM 2007 standard edition).
Please note the "known issues" that are documented in the module description.
Added "data correction" options to findscu.

Added two new options that enable/disable the automatic data correction (e.g.
removal of trailing padding) to the findscu command line tool. The default
is still to disable the data correction, i.e. the same behavior as before.
Thanks to forum user "gerhardh" for the original report.
Fixed issue when scaling certain images.

The image scaling methods expandPixel() and reducePixel(), which are used for
interpolation (c't algorithm), were not working correctly for certain sizes.
This commit solves an issue that was originally fixed with commit e9c3550,
but now in a more general and probably more robust manner.
Removed unneeded header include.

The standard header "cassert" is not needed any longer. So do not include it.