miscellaneous cleanups, updates, and fixes


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- files.c:read_file() - If the file we're loading has already been detected as a DOS or Mac formatted file, don't turn on NOCONVERT if we find binary chars in it.  This is because if it's detected as DOS/Mac format, at least one line has already been converted so setting NOCONVERT (which is supposed to signal that none of the file should be converted) makes no sense. (DLR)


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- Change resetpos function to be global (now called resetstatuspos.  Fixes annoying but small odd problem with cursor placement when inserting a file.  This needs to be done better in 1.3 (originally by David Lawrence Ramsey) Added this issue to TODO


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- files.c: load_history() - Fix segfault on loading huge strings from history file (David Benbennick)


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- winio.c:browser_init(), striponedir(), do_browse_from() - Various memory leak fixes (David Benbennick)


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- Memory leak fixes for files.c:do_insertfile(),do_browser(), nano.c:do_spell(), and search.c:do_replace() (David Benbennick)


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files.c:do_insertfile() - Add some more checks and fix recursion when toggling multibuffer (David Benbennick)


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- Fix screen getting trashed on signals nano can catch (TERM and HUP).  New global variable curses_ended changes to winio.c:statubar() and nano.c:die()


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- files.c:do_browser() - Fix goto directory operating dir check and tilde expansion (David Benbennick)


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- files.c:do_browse_from() - Fix path checking to fix bad paths, escaping the operating directory, new function readable_dir() (David Benbennick)


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- Fix constant curos updates from obliterating other system messages, and fix statusbar message length. Affects files.c:load_open_file(), nano.c:main(), search.c:findnextstr(), winio.c:statusbar() and do_cursorpos() (David Benbennick)


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- Changed some translatable debug messages to use %s instead of the function name, and removed gettext from two strings that had no actual words in them that should be translated.  Suggested originally by Christian Rose


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- Added search/replace history log.  Flag -H, --historylog. Flags HISTORY_CHANGED and HISTORYLOG, added entries in nanorc.sample, new functions log_history and save_history (Ken Tyler)


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- Changed do_insertfile to (a) report multibuffer status at the  prompt and allowing it to be toggled, taking into account the need to keep the translatable strings, and (b) added a variable inspath to keep track of what the string was before toggling.  I'm sure there's bugs, have at it


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