Add amsmath, amssymb and amsfonts latex packages for documentation.

doxydoc/doxygen.conf.in

@@ -586,7 +586,7 @@ INPUT_ENCODING         = UTF-8
 # *.hpp *.h++ *.idl *.odl *.cs *.php *.php3 *.inc *.m *.mm *.py *.f90
 
 FILE_PATTERNS          = *.hpp \
-			 *.h
+                         *.h
 
 # The RECURSIVE tag can be used to turn specify whether or not subdirectories
 # should be searched for input files as well. Possible values are YES and NO.
@@ -1018,7 +1018,7 @@ PAPER_TYPE             = letter
 # The EXTRA_PACKAGES tag can be to specify one or more names of LaTeX
 # packages that should be included in the LaTeX output.
 
-EXTRA_PACKAGES         =
+EXTRA_PACKAGES         =amsmath amssymb amsfonts
 
 # The LATEX_HEADER tag can be used to specify a personal LaTeX header for
 # the generated latex document. The header should contain everything until