Now MGET/MPUT prints error right away, if not connected

4 executable files
Windows exe 64 bits (signed)
Windows exe 32 bits (signed)
WSL (ubuntu) for windows linux
armv7l-glibc for technicolor modems

Changed the Makefile to compile 32bit or 64bit executables on windows (they now use different icons)
now command line options can be packed for example -a -p may be written as -ap
all connections from 172.21.x.x client (WSL2) NOT going to 172.21.x.x server now use passive mode by default
(can be changed with mode passive / mode active)

4 exe
Windows executable 64 bits (signed)
Windows executable 32 bits (signed)
WSL (ubuntu) for windows linux
armv7l-glibc for technicolor modems

Enlarged read/write buffer to 524.288 bytes for extra speeds I hope it's not too much for arm.
Making this little change, I reach the speed of 23 MB/s with a SSD
Corrected wrong speeds b,Kb,Mb to B,KB,MB
an internal transfer variable changed from int to ssize_t (according to A.I.)

3 exe as usual
Windows executable
WSL (ubuntu) for windows linux
armv7l-glibc for technicolor modems

This is a workaround (I hope) for the random "underscore artifact bug" on ENTER
Enlarged buffer to 65536 bytes for great speeds.

Windows for Microsoft Windows
WSL for Linux on Windows
armv7l-glibc for router Technicolor (NEW LIB)

No more speed bugs.

Windows for Microsoft Windows
WSL for Linux on Windows
armv7l-glibc for router Technicolor (NEW LIB)