transfer to complete.

first result.

Hopefully solves problem of asynchronous log output during sbbsctrl shutdown.

matchuser() now optionally matches built-in sysop aliases.

and other potential multi-threaded issues.

Added use of select to receive_thread to solve possible dead-lock during uploads.
Moved periodic transfer progress reports to occur even when no data is transferring.
Changed all byte value printfs to unsigned and all sockets to signed.

If resuming transfer, offset is now shown in progress reports.

Eliminated exception in send_thread() when shut-down during transfer
by no-longer dereferencing ctrl_thread pointer if shut-down in progress.

Fixed up the "waiting for transfer to complete" section to abort if server is shut-down (dangerous?) and not to disconnect over-and-over.

Eliminated race condition at end of ctrl_thread if xfer_thread is still running caused protection faults.

Failed login delay now occurs BEFORE response to client (per RFC2577).

Now restricts PORT command to ports >=1024 as recommended by RFC2577 to eliminate FTP proxy bounce attack to well known ports (e.g. SMTP).
Now delays 5 seconds on failed password attempt (as recommended by RFC2577).
Updated lprintfs.

Also fixes bug with tlast field (supposed to minutes, not seconds).

JavaScript context is now only created when needed. This should improve performance (slightly), memory usage, and reliability (hopefully).