Upgrade Doxygen configuration

This change corrects an incorrect parsing of header files
without an extension when used doxygen larger 1.8.3.1

doc/Doxyfiles/all_Doxyfile

@@ -39,6 +39,7 @@ OPTIMIZE_OUTPUT_FOR_C  = NO
 OPTIMIZE_OUTPUT_JAVA   = NO
 OPTIMIZE_FOR_FORTRAN   = NO
 OPTIMIZE_OUTPUT_VHDL   = NO
+EXTENSION_MAPPING      = no_extension=C++
 BUILTIN_STL_SUPPORT    = NO
 CPP_CLI_SUPPORT        = NO
 SIP_SUPPORT            = NO

doc/Doxyfiles/auto_Doxyfile

@@ -39,6 +39,7 @@ OPTIMIZE_OUTPUT_FOR_C  = NO
 OPTIMIZE_OUTPUT_JAVA   = NO
 OPTIMIZE_FOR_FORTRAN   = NO
 OPTIMIZE_OUTPUT_VHDL   = NO
+EXTENSION_MAPPING      = no_extension=C++
 BUILTIN_STL_SUPPORT    = NO
 CPP_CLI_SUPPORT        = NO
 SIP_SUPPORT            = NO

doc/Doxyfiles/auto_Mainpage

@@ -169,6 +169,25 @@ OPTIMIZE_OUTPUT_FOR_C  = NO
 
 OPTIMIZE_OUTPUT_JAVA   = NO
 
+# Doxygen selects the parser to use depending on the extension of the files it
+# parses. With this tag you can assign which parser to use for a given
+# extension. Doxygen has a built-in mapping, but you can override or extend it
+# using this tag. The format is ext=language, where ext is a file extension, and
+# language is one of the parsers supported by doxygen: IDL, Java, Javascript,
+# C#, C, C++, D, PHP, Objective-C, Python, Fortran (fixed format Fortran:
+# FortranFixed, free formatted Fortran: FortranFree, unknown formatted Fortran:
+# Fortran. In the later case the parser tries to guess whether the code is fixed
+# or free formatted code, this is the default for Fortran type files), VHDL. For
+# instance to make doxygen treat .inc files as Fortran files (default is PHP),
+# and .f files as C (default is Fortran), use: inc=Fortran f=C.
+#
+# Note: For files without extension you can use no_extension as a placeholder.
+#
+# Note that for custom extensions you also need to set FILE_PATTERNS otherwise
+# the files are not read by doxygen.
+
+EXTENSION_MAPPING      = no_extension=C++
+
 # Set the SUBGROUPING tag to YES (the default) to allow class member groups of 
 # the same type (for instance a group of public functions) to be put as a 
 # subgroup of that type (e.g. under the Public Functions section). Set it to 

doc/Doxyfiles/core_Doxyfile

@@ -29,6 +29,7 @@ OPTIMIZE_OUTPUT_FOR_C  = NO
 OPTIMIZE_OUTPUT_JAVA   = NO
 OPTIMIZE_FOR_FORTRAN   = NO
 OPTIMIZE_OUTPUT_VHDL   = NO
+EXTENSION_MAPPING      = no_extension=C++
 BUILTIN_STL_SUPPORT    = NO
 CPP_CLI_SUPPORT        = NO
 SIP_SUPPORT            = NO

doc/Doxyfiles/doxyfile.cmake

@@ -29,6 +29,7 @@ OPTIMIZE_OUTPUT_FOR_C  = NO
 OPTIMIZE_OUTPUT_JAVA   = NO
 OPTIMIZE_FOR_FORTRAN   = NO
 OPTIMIZE_OUTPUT_VHDL   = NO
+EXTENSION_MAPPING      = no_extension=C++
 BUILTIN_STL_SUPPORT    = NO
 CPP_CLI_SUPPORT        = NO
 SIP_SUPPORT            = NO

doc/Doxyfiles/openthreads.doxyfile.cmake

@@ -29,6 +29,7 @@ OPTIMIZE_OUTPUT_FOR_C  = NO
 OPTIMIZE_OUTPUT_JAVA   = NO
 OPTIMIZE_FOR_FORTRAN   = NO
 OPTIMIZE_OUTPUT_VHDL   = NO
+EXTENSION_MAPPING      = no_extension=C++
 BUILTIN_STL_SUPPORT    = NO
 CPP_CLI_SUPPORT        = NO
 SIP_SUPPORT            = NO