* doc/bison.texinfo: Update.

* doc/bison.1 (mandoc): Update.
* src/system.h (EXT_GUARD_C, EXT_STYPE_H): Remove .c and .h.
* src/files.c: Support output files extensions computing.
(src_extension): New static variable.
(header_extension): New static variable.
(tr): New function.
(get_extension_index): New function, gets the index of an extension
filename in a string.
(compute_exts_from_gf): New function, computes extensions from the
grammar file extension.
(compute_exts_from_src): New functions, computes extensions from the
C source file extension, file given by ``-o'' option.
(compute_base_names): Update.
(output_files): Update.

doc/bison.info

@@ -32,9 +32,9 @@ instead of in the original English.
 Indirect:
 bison.info-1: 1307
 bison.info-2: 50189
-bison.info-3: 99779
-bison.info-4: 149657
-bison.info-5: 196400
+bison.info-3: 99814
+bison.info-4: 149692
+bison.info-5: 196961
 
 Tag Table:
 (Indirect)
@@ -71,69 +71,69 @@ Node: Mfcalc Rules72281
 Node: Mfcalc Symtab73661
 Node: Exercises80034
 Node: Grammar File80540
-Node: Grammar Outline81353
-Node: C Declarations82087
-Node: Bison Declarations82667
-Node: Grammar Rules83079
-Node: C Code83539
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-Node: Semantics92908
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-Node: Environment Variables186531
-Node: Option Cross Key187379
-Node: VMS Invocation188223
-Node: Table of Symbols189007
-Node: Glossary196400
-Node: Index202690
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+Node: How Precedence153877
+Node: Contextual Precedence155026
+Node: Parser States156817
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+Node: Mystery Conflicts161621
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+Node: Environment Variables187092
+Node: Option Cross Key187940
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+Node: Table of Symbols189568
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+Node: Index203251
 
 End Tag Table