Removed obsolete settings from Doxygen config

doxygen/Doxyfile

@@ -45,7 +45,6 @@ IDL_PROPERTY_SUPPORT   = YES
 DISTRIBUTE_GROUP_DOC   = NO
 SUBGROUPING            = YES
 TYPEDEF_HIDES_STRUCT   = NO
-SYMBOL_CACHE_SIZE      = 0
 #---------------------------------------------------------------------------
 # Build related configuration options
 #---------------------------------------------------------------------------
@@ -75,7 +74,6 @@ GENERATE_DEPRECATEDLIST= YES
 ENABLED_SECTIONS       = 
 MAX_INITIALIZER_LINES  = 30
 SHOW_USED_FILES        = YES
-SHOW_DIRECTORIES       = NO
 SHOW_FILES             = YES
 SHOW_NAMESPACES        = YES
 FILE_VERSION_FILTER    = 
@@ -130,7 +128,6 @@ IGNORE_PREFIX          =
 GENERATE_HTML          = YES
 HTML_OUTPUT            = html
 HTML_FILE_EXTENSION    = .html
-HTML_ALIGN_MEMBERS     = YES
 HTML_DYNAMIC_SECTIONS  = YES
 GENERATE_DOCSET        = NO
 DOCSET_FEEDNAME        = "Doxygen generated docs"