and Frame.cleartoeol()'s instead.

on rPi3) by using Frame.home() and Frame.cleartoeol() rather than
Frame.clear().

where Display.prototype.__getUpdateList__ was taking > 1 second on an rPi3:
We need to avoid using Frame.clear() which invalidates the entire frame
and requires an update check of every cell (e.g. thousands in a typical
frame). So we're going to depend on Frame.cleartoeol() which needed its
own optimization to invalidate every cell of the current line even when
the cells were already blank (undefined). So only mark the cells for
update if they actually have data in them that is being cleared.

Also, the putmsg() method was taking on a CRLF to the output string when
word-wrap was enabled. So removing the trailing whitespace after word
wrap does its thing. If this breaks other scripts, then perhaps we need
to restore the original CRLF on the end of the word-wrapped string, but
*only* if there was a CRLF on the end of the original string to begin
with.

for the json-service.ini "dir" key. The code that parses that value is not
very tolerant of the absence of a trailing slash.

Add CSI I support.
Fix CSI SP d support.

Loadable Modules for these (nodelist and privatemsg) configured by default
in SCFG->Sysstem->Loadable Modules.
Disable FIDOIN and FIDOOUT timed events by default.
Disable NEWSLINK and LISTSRVR timed events by default.
Added ftn-setup.js and xtrn-setup.js to the Operator xtrn menu.

Added "-export" for F. Krueger (2:333/808.1) which exports every message from
the specified message base into a separate text file (in the sbbs/temp dir).
e.g. "jsexec <msgbase-code> -export"
Uses RFC-822 style header syntax. No dot-stuffing. Strips Ctrl-A codes. Uses
CRLF-terminated lines. All these things could be configurable with options
easily enough if someone wants different behavior.

in adjustuserrec() - as reported by Nelgin, the finder and reporter of bugs.
32-bit fields were protected, but not 16-bit fields, so they could/would
"wrap around" (e.g. after exceed 65535).
I did not add protection for 8-bit integer wrap as there's only one (leech) and
that's not relevant/used these days.

Apparently, SyncTERM is doing tabs differently than XTerm, and there's some
get graphics attribute weirdness in XTerm as well.