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Conditionalize libhistory checks accordingly.
* README: Mention "--disable history".
* src/history.c: Surround most of the code with
"#ifdef HAVE_READLINE_HISTORY_H".
* src/ratpoison.h: Only #include history.h when
"#ifdef HAVE_READLINE_HISTORY_H".
* src/main.c (main, clean_up): Only load and save history,
respectively, when "#ifdef HAVE_READLINE_HISTORY_H".
* src/editor.c (editor_history_previous, editor_history_next):
Return EDIT_NO_OP when not "#ifdef HAVE_READLINE_HISTORY_H".
(editor_enter): Do not do line expansion or history add
when not "#ifdef HAVE_READLINE_HISTORY_H".
* doc/ratpoison.texi: Mention that history cycling and
processing is not available when ratpoison is configured
with the "--disable-history" option.
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