Bug#804569: dicomscope: build-depends on libdcmtk2-dev which is no longer built

[Gert Wollny]

I've uploaded a patch to svn, but there are more errors like this. It
seems all related methods now uses the OFCondition return value, and
pass an OFString& parameter. 

I'll try to get the complete patch out until tomorrow. 

Best,  
Gert