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miscellaneous cleanups, updates, and fixes


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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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- nanorc.sample: - Added some examples for groff and the nanorc courtesy of Robert D. Goulding.  Added double hash marks to comment lines, so people who uncomment the beginning of every line won't get syntax errors


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- Add a better string matching sequence that includes escaped quotes (thanks to Carl E. Lindberg, who doesn't even know he helped ;-)


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- nanorc.sample: - Fix the c-file regex for all caps words to be extended regex format ({} instead of \{\}) (found by DLR)


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Benbennick and me


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- Added syntax command to .nanorc file, to allow multiple syntaxes.  New function color.c:update_color(), calls in various files.c places, syntaxtype struct, global variables syntaxes, syntaxfile_regexp and synfilematches


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- General - New flag RELATIVECHARS to show column positino relative to the current line instead of the current file.  New flag -C, --relative, changes to do_cursorpos()


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- General - Added multiple-line regex support.  Format in .nanorc is start=regex end=regex.  Cleaned up nanorc:parse_colors(), added parse_next_regex(), changes to edit_add in winio.c(), changes to colortype, cleaning up some old cruft


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Preliminary syntax highlighting support.  New functions colortoint() and parse_color() in rcfile.c, new code in edit_add() in winio.c to actually do the highlighting.  It's not even close to pretty yet :P


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General: - New flag -o, --operatingdir, similar to Pico's -o mode.  New function check_operating_dir(), changes to load_file (arg), open_file_dup_search (arg), new function do_gotopos for -F.


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