Compare parts of 2 different LECODE binary files. SETTINGS
is a string with plus and minus signs to switch between plus/minus modes, and some key letters to select parts: s:size, h:header, t:timestamp, b:body, p:parameters, d:data, c:code and a:all. In plus-mode, a test is enabled, in minus-mode it is disabled. Scanning starts in plus-mode.
Example: a-t: compare all except timestamps and edit infos.
The exist status is OK (0) if nothing differ, DIFFER (2) if at least one test failed, or an error code.