Get internal documentation generated in the right place

templates/tools/doxygen/Doxyfile.include

@@ -77,7 +77,8 @@ PROJECT_LOGO           =
 # entered, it will be relative to the location where doxygen was started. If
 # left blank the current directory will be used.
 
-OUTPUT_DIRECTORY       = doc/ref/${packagename.lower()}
+OUTPUT_DIRECTORY       = doc/ref/${
+		packagename.lower() + ('.internal' if internal else '')}
 
 # If the CREATE_SUBDIRS tag is set to YES then doxygen will create 4096 sub-
 # directories (in 2 levels) under the output directory of each output format and

tools/doxygen/Doxyfile.c++.internal

@@ -60,7 +60,7 @@ PROJECT_LOGO           =
 # entered, it will be relative to the location where doxygen was started. If
 # left blank the current directory will be used.
 
-OUTPUT_DIRECTORY       = doc/ref/c++
+OUTPUT_DIRECTORY       = doc/ref/c++.internal
 
 # If the CREATE_SUBDIRS tag is set to YES then doxygen will create 4096 sub-
 # directories (in 2 levels) under the output directory of each output format and

tools/doxygen/Doxyfile.core.internal

@@ -60,7 +60,7 @@ PROJECT_LOGO           =
 # entered, it will be relative to the location where doxygen was started. If
 # left blank the current directory will be used.
 
-OUTPUT_DIRECTORY       = doc/ref/core
+OUTPUT_DIRECTORY       = doc/ref/core.internal
 
 # If the CREATE_SUBDIRS tag is set to YES then doxygen will create 4096 sub-
 # directories (in 2 levels) under the output directory of each output format and