As part of DM-2635 I propose to make the following changes to the C++ API of the "utils" package:

Remove two functions we are not using anywhere:

• guessSvnVersion: this is clearly useless now that we use git
• stringToAny: we aren't using it, and it has no documentation

Rename lsst::utils::eups::productDir to lsst::utils::getPackageDir and remove the version argument. Note that the version argument has only one valid value, so it's never been useful. This would be the implementation of DM-2635.