doxygen: remove obsolete options from Doxyfile

The options USE_INLINE_TREES, SHOW_DIRECTORIES and HTML_ALIGN_MEMBERS
became obsolete with doxygen 1.8.1 (releaded 2012-05-19). The generated
outpu for older doxygen versions should not change since they were set
to the default value.

doc/Doxyfile

@@ -489,12 +489,6 @@ MAX_INITIALIZER_LINES  = 30
 
 SHOW_USED_FILES        = YES
 
-# If the sources in your project are distributed over multiple directories
-# then setting the SHOW_DIRECTORIES tag to YES will show the directory hierarchy
-# in the documentation. The default is NO.
-
-SHOW_DIRECTORIES       = NO
-
 # Set the SHOW_FILES tag to NO to disable the generation of the Files page.
 # This will remove the Files entry from the Quick Index and from the
 # Folder Tree View (if specified). The default is YES.
@@ -848,12 +842,6 @@ HTML_COLORSTYLE_GAMMA  = 80
 
 HTML_TIMESTAMP         = YES
 
-# If the HTML_ALIGN_MEMBERS tag is set to YES, the members of classes,
-# files or namespaces will be aligned in HTML using tables. If set to
-# NO a bullet list will be used.
-
-HTML_ALIGN_MEMBERS     = YES
-
 # If the HTML_DYNAMIC_SECTIONS tag is set to YES then the generated HTML
 # documentation will contain sections that can be hidden and shown after the
 # page has loaded. For this to work a browser that supports
@@ -1034,11 +1022,6 @@ ENUM_VALUES_PER_LINE   = 4
 
 GENERATE_TREEVIEW      = NO
 
-# By enabling USE_INLINE_TREES, doxygen will generate the Groups, Directories,
-# and Class Hierarchy pages using a tree view instead of an ordered list.
-
-USE_INLINE_TREES       = NO
-
 # If the treeview is enabled (see GENERATE_TREEVIEW) then this tag can be
 # used to set the initial width (in pixels) of the frame in which the tree
 # is shown.