lynx-dev partial display revisited + more toggle patch

[Bela Lubkin]

Attached, a patch which does two things:

(1) applies the "partial display" patch, modified from:

      http://www.flora.org/lynx-dev/html/month0398/msg00993.html

    The behavior is controlled by a compile-time option (DISP_PARTIAL),
    by a command-line argument (-partial), and by a lynx.cfg option
    (PARTIAL).

    I believe this code is in good enough shape to be put into the main
    code set now, *disabled* by default, as with several other
    "experimental" patches.  (Its compilation is enabled by default, in
    the patch.)

    For those who missed this, it's a patch which provides on-the-fly
    display of text and HTML documents, while download is progressing.
    Some problems have been reported with it, so be careful.  I haven't
    had trouble, but haven't had it turned on very consistently.

(2) modifies my previous "-toggle=[01]" patch.  The ability to
    explicitly set values is extended to SET_ARG and UNSET_ARG flag
    types, and a new syntax is supported:

      -toggle-     (set that toggle to FALSE)
      -toggle+     (set that toggle to TRUE)

    e.g.:   lynx -show_cursor+ -case-

    This syntax is a little ugly, but should have no
    internationalization problems, and I believe it should be
    immediately understandable to most users.  "-case-" turns off case
    sensitivity: the default, but it might be reassuring to firmly state
    your preference.

    I apologize to John Davis for immediately uglifying his neat new
    code...

    NOTE: this allows you to change a few flags that would previously
    have been controlled by lynx.cfg, and are security-related, such as
    -locexec or -telnet.  I believe there is no issue, because if the
    user can control the command line to Lynx, he could have run `lynx
    -cfg my_cfg_file` and circumvented those settings anyway.

Patch applies to 2.8.1dev.9 + my previous "-toggle" patch,

  http://www.flora.org/lynx-dev/html/month0598/msg00147.html

>Bela<

=============================================================================

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