32-bit file size limitation.

We really need a way to construct a Socket object passing a descriptor.

outbuf_empty event in sexyz is still having problems with multi-CPU fast
transfers.

Use SMB_CURMSG @-Code to display current message "number" (offset+1).

Reading Mail prompt with multiple undeleted mails remaining, instead make
(K)ill All Mail command available, which can be still be reversed before
quitting the reading mail prompt.

and fixed possible local abort ignore due to previous commit.
Some if/else/if to switch/case conversion.

This prevents is_cancelled from being called three times for ever recv_byte

(oops, wrong commit message on last commit of xtrn.cpp)

extension problem more obvious.

_FILE_OFFSET_BITS=64, and use fseeko() and ftello() for 64-bit offset support
(instead of fseek() and ftell()) - also redefine off_t on Win32 to int64_t and
removed filelen_t and fileoff_t typedefs (use off_t instead).

in case the current (termainl) window is smaller (such as with curses mode
and a width that is not exactly 132 or 80).