Expose drop network method for SCU

Allow persistent use of the DcmSCU without keeping the socket tied up.
Back-ported MinGW fixes from DCMTK 3.6.0
From git.dcmtk.org: Added explicit default constructor to keep Intel Compiler 11.1 quiet. (commit: c36732565, http://git.dcmtk.org/web?p=dcmtk.git;a=commit;h=c36732565c426091d9f282eca113e62cec75ea0d)
Also fixes compilation with gcc 4.6 (error: /tmp/DCMTK/dcmimgle/include/dcmtk/dcmimgle/discalet.h:189:48: error:
uninitialized const ‘rep’ [-fpermissive]).
Merge pull request #6 from ivmartel/patched

Fix for Intel Compiler 11.1 and gcc 4.6
Minor fixes to keep XCode 4.2 on Mac OS X Lion (clang compiler) quiet.

Based on http://git.dcmtk.org/web?p=dcmtk.git;a=commit;h=dbadc0d8f3760f65504406c8b2cb8633f868a258

Conflicts:

	CHANGES.361
	dcmimage/include/dcmtk/dcmimage/diargpxt.h
	dcmimage/include/dcmtk/dcmimage/dicmypxt.h
	dcmimage/include/dcmtk/dcmimage/dicocpt.h
	dcmimage/include/dcmtk/dcmimage/dicoflt.h
	dcmimage/include/dcmtk/dcmimage/dicorot.h
	dcmimage/include/dcmtk/dcmimage/dicosct.h
	dcmimage/include/dcmtk/dcmimage/dihsvpxt.h
	dcmimage/include/dcmtk/dcmimage/dipalpxt.h
	dcmimage/include/dcmtk/dcmimage/dirgbpxt.h
	dcmimage/include/dcmtk/dcmimage/diybrpxt.h
	dcmimage/include/dcmtk/dcmimage/diyf2pxt.h
	dcmimage/include/dcmtk/dcmimage/diyp2pxt.h
	dcmimgle/include/dcmtk/dcmimgle/diflipt.h
	dcmimgle/include/dcmtk/dcmimgle/dimoflt.h
	dcmimgle/include/dcmtk/dcmimgle/dimoipxt.h
	dcmimgle/include/dcmtk/dcmimgle/dimorot.h
	dcmimgle/include/dcmtk/dcmimgle/dimosct.h
	dcmimgle/include/dcmtk/dcmimgle/dirotat.h
	dcmimgle/include/dcmtk/dcmimgle/discalet.h
	ofstd/include/dcmtk/ofstd/ofoset.h
	ofstd/libsrc/ofchrenc.cc