clearer code for dealing with files like Episode-2.edf in tree scanner
new file common/containers.hh
discard and report unsupported files early in tree scanner
clarify CTypedSource::TType values (subsume edfplus into edf)
lessen templatedness of make_fname_* functions
ICM aborted
don't lose embedded annotations in CEDFFile::CEDFFile(CEDFFile&&)
elicit embedded annotations on montage