Remove obsolete StandardRecord classes
Various classes that were only used as the basis of inheritance hierarchies are now unneeded. But we need to keep them around in the dictionaries for a while to be able to read old files.
Turnover on CAFs is quicker than on other types of files where we've obsoleted products. On the other hand, interest in looking at old ones might be higher.
One idea: collect the minimal information necessary about each class into a single file, SRObsolete.h or whatever. And put some doxygen warnings on them.