Chris Walker reports that if you give a trailing slash on the pathname

you tell agedu to scan, it will store that slash in the index and
confuse parts of the rest of the code. Strip such slashes off before
beginning the scan.

git-svn-id: svn://svn.tartarus.org/sgt/agedu@9416 cda61777-01e9-0310-a592-d414129be87e