add missing include of iostream

While working with ROOT6, I discovered 28 more CMSSW files that failed to compile because of a missing include of iostream.  This pull request adds the missing include to each of these files.  It also removes any remaining CVS tokens (e.g. $Id) in these files only.
Tested with checkdeps -a and the relvals.
Note, two of the affected files are header files, but cout is used explicitly in both headers, so the include is needed for the header to compile.
Please include this trivial technical fix in CMSSW_7_0_0_pre7, bypassing signatures if necessary to make pre7.