Improved Telnet option processing and event execution log output.

tear lines (---) to non-tear lines (-+-).

files are not created as root.

the internal code at the first white-space character (don't include the level
and flags in the code) - as reported by access_d

I'm pretty sure this wasn't broken before the great spidermonkey upgrade of
2011, but whatever. :-)

Thanks rfrederick!

(greater than the number of configured externals) - I'm not sure why I was
using the value from the node.dab here, but it wasn't necessary so using local
variable now instead.

back into the container because str_list_t's tend to realloc()

global object exits.

This fixes a problem where the terminal server reuses the same global object
for all JS scripts, and they uses nested exec()s.  When the innermost script
would exit, the on_exit evals would occure in IT'S scope rather than in the
scope it was defined in, resulting in incorrect behaviour.

(and thus SDL).

stack clobbering silent killer that is the massive line read in json_client.js

external mail processors.

of the first message in the thread, or 0 if unknown (e.g. legacy message). When
a new message is created, the thread_id value of the message being replied-to
will be used, else if the new msg is not a reply, then the new message's number
will be the value used for the thread_id.
This "thread-id" feature (Deuce's idea) allows threads with a common parent to
remain logically grouped after the original messages in the thread have been
purged (though the original hiearchy will start to be lost).

for use with monit.

objection based on the lameness of *nix shell syntax.

pktname() will no longer return a filename of an existing file under any
circumstance (even if there are 200+ *.pkt/pk_ files).
pkt_to_pkt() cleanup using a packet's file stream pointer to indicate it is
open or not.
Added debug log output for packet file open error (for access_d).