Added backtrace (bt) and up/down commands.
Allow specifying breakpoints in file:line format for future load()s.

Breakpoints are a small memory leak right now as there's no way to clear them.

Running jsexec with the -D argument will enter the debugger.  Inside the
debugger, there are the following commands:
"r"                runs the script
"clear"            clears any pending exceptions (mostly useless)
"break ###"        set a break at the specified line number
"e <statement>"    eval()uates <statement> in the current frame
"eval <statement>" also eval()s

This is a proof of concept right now since it's only in jsexec and the command
parser is a joke.  Eventually, this will also work for ;EXEC scripts in the
BBS and be even more awesome.  This should be enough to get mcmlxxix off my
back though.

MAX_POST_LEN.

This makes the previous change effectively useless except for using up
space on the hard drive, but is stops from malloc()ing a copy of the data
that is unusable.

solve all the problems involved in a file upload though, so don't get too
excited.

where the file would/could be left open if fdopen() failed.

(e.g. without spaces) of the user's originally submitted alias would be
allowed as a QWK-ID.

From RFC2616 section 2.2 (Basic Rules)

   HTTP/1.1 defines the sequence CR LF as the end-of-line marker for all
   protocol elements except the entity-body

conflict with SMB and other Synchronet-specific properties.  Instead,
add them to an extra_headers object.

Fixes a weird an unlikely bug encountered in rec.radio.cb spam.

Apparently, it IS defined on Linux and FreeBSD, but is not currently
defined on OpenBSD (but I bet it used to be!).  This should fix the strange
zip behaviour reported by khelair.

www/mozilla-firefox port.