* doc/Doxyfile.in (FILE_PATTERNS): Remove *.hxx.

* src/sanity/80columns.test, src/sanity/style.test: Process *.hxx files.
* src/tgbaalgos/ndfs_result.hh: Rename as ..
* src/tgbaalgos/ndfs_result.hxx: ... this, so it does not get
documented (and so Doxygen do not complain).
* src/tgbaalgos/magic.cc, src/tgbaalgos/se05.cc, src/tgbaalgos/tau03.cc,
src/tgbaalgos/tau03opt.cc: Adjust include.
* src/tgbaalgos/Makefile.am: Rename ndfs_result.hh as ndfs_result.hxx
and do not install it, this is a private header.

src/sanity/80columns.test

@@ -8,7 +8,9 @@ rm -f failures
 
 for dir in "${INCDIR-..}" "${INCDIR-..}"/../iface; do
 
-  find "$dir" \( -name "${1-*}.hh" -o -name "${1-*}.cc" \
+  find "$dir" \(    -name "${1-*}.hh" \
+                 -o -name "${1-*}.hxx" \
+                 -o -name "${1-*}.cc" \
 		 -o -name "${1-*}.test" \) -a -type f -a -print |
   while read file; do
      x='........................................'

src/sanity/style.test

@@ -26,8 +26,10 @@ tmp=incltest.tmp
 
 for dir in "${INCDIR-..}" "${INCDIR-..}"/../iface; do
 
-  find "$dir" \( -name "${1-*}.hh" -o -name "${1-*}.cc" \) \
-		 -a -type f -a -print |
+  find "$dir" \(    -name "${1-*}.hh" \
+                 -o -name "${1-*}.hxx" \
+                 -o -name "${1-*}.cc" \) \
+	      -a -type f -a -print |
   while read file; do
     if grep 'GNU Bison' "$file" >/dev/null ||
       grep 'generated by flex' "$file" >/dev/null ; then