Adding the possibility to hardcode the CINT dictionary type from within a

Reflex dictionary. This will be done via an attribute "iotype" in the
seletion.xml file. E.g.
<class name="TrackD32">
  <field name="fCov" iotype="ROOT::Math::SMatrix<Double32_t,5,5,ROOT::Math::MatRepStd<Double32_t,5,5> >"/>
</class>


git-svn-id: http://root.cern.ch/svn/root/trunk@15614 27541ba8-7e3a-0410-8455-c3a389f83636