ver 20240920
 - checking that B: is not a phantom drive before hooking it
 - ethflop signals the TSR's drive letter to the server (nicer messages)
 - transient code checks the health of TSR's stack (stack overflow detection)
 - configurable stack size ($1-$9), can lower TSR footprint to 1.4K, see doc
 - maximum stack usage during TSR lifetime can be consulted via "ETHFLOP !"
 - when displaying messages, ethflop terminates them with proper CR/LF
 - env seg in PSP is zeroed before going TSR (just in case, suggested by ECM)
 - TSR closes all its handles to avoid potential SFT leaks (thx ECM)
 - improved validation of answer frames (ECM)
 - versioning scheme changed from x.x.x to YYYYMMDD

ver 0.6.1 (02.09.2024)
 - first retransmission is after 250ms then every 440ms, timeouts after 2s
   (was: single retransmission after 50ms and timeout after 100ms)
 - arguments are case-insensitive
 - minor memory optimizations (lower RAM footprint)
 - relicensed from ISC to MIT

ver 0.6 (03.10.2019)
 - initial public release
