* doc/bison.texinfo: Correct typos in previous fix.

* doc/bison.texinfo: Correct typos in previous fix.
* data/glr.c: b4_filename -> b4_file_name.
* data/lalr1.cc: Likewise.  Also, b4_filename_type -> b4_file_name_type.
All uses changed.
(class position): filename -> file_name.  All uses changed.
* data/yacc.c: b4_filename -> b4_file_name.
* lib/bitset.h: filename -> file_name in local vars.
* lib/bitset_stats.c: Likewise.
* src/files.c: Likewise.
* src/scan-skel.l ("@output ".*\n): Likewise.
* src/files.c (file_name_split): Renamed from filename_split.
* src/muscle_tab.c (muscle_init): Output b4_file_name, not b4_filename.