highlighting.
* edit/Makefile.am: Add choosesyntax.c.
* edit/edit.c (edit_init): Set option_auto_syntax to 1 on every invokation
of the editor.
* edit/edit.h: Pass char*** to edit_load_syntax(). Add parameters for
syntax dialog and override.
* edit/editmenu.c (menu_options): Add menu option to override syntax
hightlighting.
* edit/editoptions.c (edit_options_dialog): Pass option_syntax_type to
edit_load_syntax().
* edit/syntax.c (edit_read_syntax_file): Dynamically allocate and fill
syntax list pnames.
* edit/syntax.c (edit_load_syntax): Use char*** for syntax list.
* src/wtools.h: #include "widget.h" and remove redundant declarations
of Dlg_head and WListbox.
* usermap.h: Likewise.
* Makefile.am: Likewise.
* editcmd.c: Define new editor commands which had been coded
inline before.
This change also affects some other files.
* edit-widget.h: Invented a new type edit_key_map_type instead of
using long for.
* editkeys.c: Using that type.
