miscellaneous cleanups, updates, and fixes


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- nano.c:justify_format() - Fix ugly behavior when wrapping spaces at the end of long words (David Benbennick)


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@1477 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

- Remove do_preserve_msg, as using -p still gives Pico-style string behavior, so an annoying message every invocation is probably unneeded (all cheer)


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- nano.c:main() - Silence annoying compiler messages about clobbering and uninitialized variables by moving variable inits to the top of main() and re-initializing them after the sigsetjmp()


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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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- 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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-nano.c:do_justify() - Unset KEEP_CUTBUFFER so nano won't crash with subsequent ^K cuts and justifies (David Benbennick)


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- nano.c:do_mouse() - Fix the mouse code to work with lines longer than COLS and with the proper positioning, including special characters (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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- nano.c:do_int_spell_fix(), do_int_speller() - Fix crashes with mark position, current_x position and edit_update args (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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nano.c:main() - Call load_file with arg 0 for insert, as we aren't really doing an insert, allows new_file() to run if we open a non-file at startup


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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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- Fixed awful scrolling in do_int_speller. Problem was findnextstr() calling edit_update(), though screen updating is not its business Added checks in do_search() and do_replace_loop() to do the checks.  It really should not be done here, as some function in winio.c should handle this, but I can't seem to find a good place to put this check


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nano.c:do_int_speller - Change all child error checks to use one goto (gasp) called close_pipes_and_exit, so we don't leak FDs


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        - Add in Pico's -p flag, (-p, --preserve).  To preserve the XON and XOFF keys (^Q and ^S).  Add warning if we invoke -p and add checks for using --preserve (to skip warning) and --pico (to force showing it).  New flag PRESERVE, function do_preserve_msg(), changes to main(), signal_init()


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More bits left over from getting rid of pico mode, no more CLEAR_BACKUPSTRING, woo!  Also reodered flags to remove gaps


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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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