MinFileSize and MaxFileSize keys in the [ftp] section of the ctrl/sbbs.ini file
these values default to 0 which effectively applies no min/max to uploaded
files. Set MinFileSize to 11 to defeat the recent penetration testing seen
uploading 10 byte files with random filenames (8 alpha cars ending in ".txt")
with 8 alpha chars in the file, followed by a CRLF pair for a total size of 10
bytes.
Fixed bug whereby failed/aborted uploaded files would be left (not deleted).
Log errors when any file deletion fails in the FTP server.