miscellaneous cleanups, updates, and fixes


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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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- nano.c:do_help () - Fix line lengths not being computed properly, causes display glitches most noticeable with < 20 rows.  New function nano.c:line_len(). (David Benbennick)


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- winio.c:nanogetstr() - Remove unnecessary reset of x since it is now handled elsewhere (David Lawrence Ramsey)


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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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- 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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- Fix cursor position being saved when escaping out of nanogetstr with keys like ^Y and ^V.  New arg resetpos to nanogetstr(), added static int resetpos in statusq() (bug found by DLR)


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- winio.c:edit_refresh() - Fix cursor being above as well as below the current screen (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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- winio.c:bottombars() - Change strcpy of gettext() Up string to strncpy of max width 8, to stop stupid strcpy crash


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- winio.c:nanogetstr - Move down NANO_SMALL in tab check so nano won't complain if just NANO_SMALL is defined (David Benbennick, presumed fix)


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Add a buffer holder for current search/replace data, so we don't lose it when going back through history


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Completely removed PICO_MODE, as with the search/replace history patch we should have the extended functionality we can without being incompatible with pico


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winio.c:edit_refresh() - Turn on leaveok() so the cursor doesn't bounce around the screen while we're updating it (most noticeable when using color syntax over a very slow connection)


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Another DLR fixin: credits and DOS/Mac compatibility.  Also get rid of those colons in ChangeLog after function names


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