* etags.c (lowcase): Use the standard tolower function.
(substitute): Remove some wrong and some useless code related with escape `\` character in regexp replacement string. (TEX_defenv): Added part, appendix, entry, index. Removed typeout. (lang_suffixes): New suffixes: .hpp for C++; .f90 for Fortran; .bib, .ltx, .TeX for TeX (.bbl, .dtx removed); .ml for Lisp; .prolog for prolog (.pl removed). (massage_name, etags_getcwd): Use lowcase instead of tolower. (regex.h): Don't include it if REGEX_IN_LIBC is defined. (C_entries, find_entries): Added comments about memory leakage. (add_node): Dead code removed.
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