Bug: Eliminate unnecessary sorting in enumerating accounts, sessions, and persistent logins

When enumerating public accounts for the browse public accounts page, or all user accounts, open sessions, or persistent login tokens for the administrator, we unnecessarily sorted the names of the files in the respective directories before retrieving them into the hash used to build the displayed table. Since the table generation code sorts the hash keys, there is no need to sort the file names, which can be very time consuming when these directories get large. If these directories get very much larger, it may make sense to read them serially and perform the {\tt grep()} on them within the loop rather than bringing the directory into memory and using the {\tt grep()} function as presently done.