Log Message:
x11/x3270: update to 4.0ga13.

Includes the curses version of the terminal emulator now.

Changelogs are quite fragmented over various alpha/beta versions; here
are some main points.

Major changes
Task engine

The scripting infrastructure has been rewritten. It is now called the task \ 
engine. There are no longer any artificial dependencies between actions \ 
initiated by different sources (keyboard, scripts, HTTP requests, etc.). \ 
Accidental blocking behavior has been (almost) eliminated. Unrelated operations \ 
are now properly concurrent, within the limitations of there still being just \ 
one emulated terminal and host session to control. For example, c3270 and wc3270 \ 
now continue to respond to host messages while at the prompt or while a printer \ 
dialog is showing.

Tasks also carry context consistently now. For example, the Wait(Output) now \ 
works with HTTP requests.

The state of the task engine can be displayed with the Tasks query.
b3270

A new emulator has been created, b3270. It is a common back-end process that \ 
handles the 3270 protocol and host interactions, communicating with different \ 
user-interface implementations using a simple XML-based protocol. None of the \ 
existing emulators have been converted to use b3270, but a new Windows emulator \ 
(wx3270) uses it.
x3270 prompt

The c3270 prompt has been generalized and is available to all of the 3270 \ 
emulators as the x3270 prompt. The Prompt() action (or a menu option) creates a \ 
new instance of the prompt in a window. The prompt now uses color to distinguish \ 
error messages.
tcl3270 re-implementation

tcl3270 has been re-implemented as a simple wrapper around s3270. This \ 
eliminates many of the arbitrary limitations and blocking behaviors of the \ 
previous implementation.
Show() / Query() merge and expansion

The common Query() action and the c3270/wc3270-specific Show() action have been \ 
merged and expanded. Show() is an alias for Query(), and many queries have been \ 
added or changed:

(omitted)

Set()/Toggle() changes

A new Set() action has been added, which is similar to the Toggle() action. The \ 
difference between Set() and Toggle() happens when no value is specified for a \ 
setting. Without a value specified, Set() will display the current value; \ 
Toggle() will (if the setting is Boolean) invert the setting's value. Both \ 
actions list the current values of all settings if no parameters are given.

Many additional resources can now be changed at run-time via Set() or Toggle().

These previously-deprecated resources were removed:

    cursorPos (assumed true now)
    dsTrace
    eventTrace
    dftBufferSize

x3270 APL mode

APL keyboard operation on x3270 has changed. There is no longer a fixed APL \ 
keymap. Instead, the key combination Shift-Escape toggles a new APL mode, which \ 
changes how how paste operations are handled (preferring the APL definitions for \ 
Unicode characters that have both APL and non-APL mappings), as well as setting \ 
a temporary keyboard map and a temporary compose map.

The separate APL host code page has been removed; APL text can be displayed \ 
using any host code page.

after this, lots of bug fixes and minor tweaks, as far as I can tell.