Add options missing from the existing Doxyfile

Both have been present in DOCS/Doxyfile since that file was added.

Author: turboencabulator

CMakeLists.txt

@@ -621,6 +621,7 @@ if(BUILD_HTML_DOCUMENTATION OR BUILD_MAN_DOCUMENTATION)
     set(DOXYGEN_SOURCE_BROWSER YES)
     set(DOXYGEN_CREATE_SUBDIRS YES)
     set(DOXYGEN_SEPARATE_MEMBER_PAGES YES)
+    set(DOXYGEN_TAB_SIZE 8)
     set(DOXYGEN_EXTRACT_ALL YES)
     set(DOXYGEN_FILE_PATTERNS *.f *.f90 *.c *.h )
     set(DOXYGEN_RECURSIVE YES)
@@ -646,6 +647,7 @@ if(BUILD_HTML_DOCUMENTATION OR BUILD_MAN_DOCUMENTATION)
     if (BUILD_HTML_DOCUMENTATION)
         set(DOXYGEN_GENERATE_HTML YES)
         set(DOXYGEN_HTML_OUTPUT explore-html)
+        set(DOXYGEN_HTML_TIMESTAMP YES)
         set(DOXYGEN_INLINE_SOURCES YES)
         set(DOXYGEN_CALL_GRAPH YES)
         set(DOXYGEN_CALLER_GRAPH YES)