There are a number of conio changes in here too... too many to list.  Check
the diffs if you actually want to know what changed.

Change the Get/Set FlowControl function to control both tx and rx flow control and accept/return a bit-field so multiple flow control methods can be enabled concurrently.

Change the return value and arguments to Get/SetTxFlowControl functions to support multiple types of flow control, not just RTS/CTS, but also DTR/DSR and XON/OFF (and obviously, none).
TODO: consider how the dcb.fRtsControl member might need to be adjusted by the comSetTxFlowControl function (for Win32).

Need *nix implementations now.

Need a *nix implementation now.

multiple definition of `area_sort_desc';
reported by Accession

multiple definition of `pktTypeStringList';
multiple definition of `mailStatusStringList';

SEND using auto-detected DNS server address: 2001:4860:4860::
!SEND INVALID DNS server address: 2001:4860:4860::
Fix off-by-one buffer overflow while at it.

large uploads remained an issue as if there's no data received on the
connection for over a second, the input thread would abort due to timeout.

Fixes bug https://sf.net/p/syncterm/tickets/21/
This is serious enough to trigger a new RC I believe (sigh)

When adding a Fido or Internet networked sub-board (e.g. importing from a list file), set the "no voting allowed" setting by default.
Only local and QWK-networks supporting voting today.

If sbbs_t::menu() is called with a menu file/code that includes wildcard characters (? or *), do the random menu thing.
This is true for Baja MENU function and JS bbs.menu() as well as MENU/CONDMENU @-codes, so no longer need a bbs.random_menu() function (removed).

Create sbbs_t::random_menu() (JS bbs.random_menu()) - to make the display of a randomly-chosen menu file from text/menu, very easy.

Fix strListDedupe() - if a string is removed (cause it was a dupe), don't increment the second loop counter or you'll skip past the NULL-terminator.

has type 'long int'

warning: ‘subs’ directive writing 4 bytes into a region of size between 1 and 64

Improve send-file performance on Windows (over Gb Ethernet LAN) from about 1 MBytes/second to 25+ MBytes/second by increasing the size of the ringbuffer (from 20 -> 256 KBytes) and the size of the file-read buffer in sock_sendfile().
Also log the through-put (in cps) when a file is sent.

Address warning: ‘__builtin___sprintf_chk’ writing a terminating nul past the end of the destination
reported by Nelgin via irc.

that support large file offsets (e.g. 64-bit Linux).
Considered returning ssize_t (like sendfile does), but opted for off_t. Could
be convinced otherwise.

(64-bit off_t), e.g. 64-bit Linux. Issue reported by plt via irc.

Switch to strncpy().

Include a replied-to message's to field to be selected in the post-to history (arrow-up to choose strings from history).

Add/use functions to convert the 3 msg attribute fields to strings of comma-separated attribute names.

Fix heap corruption resulting from use of internal message editor "/E" (edit line) command when extended a line of text to a length longer than what was allocated.

Rename CON_MOUSE_REPORT to CON_MOUSE_SCROLL (since that is all it is used for).