\usepackage{fixltx2e} must come before use \usepackage{float}

The \usepackage{doxygen} statement adds float as a depenency.
If the order is wrong the latex generation fails with:
LaTeX Error: Unknown float option `H'
Fix typo
Bug 727732 - Nested C structures/unions does not work with groups
Bug 731238 - Dead links in html documentation when using tabs for indentation in c++
Bug 730887 - [PATCH] Fix potential copy and paste error in inputstring.cpp
Merge pull request #178 from ellert/master

\usepackage{fixltx2e} must come before use \usepackage{float}
Merge branch 'master' of github.com:doxygen/doxygen
Bug 731363 - Callgraphs for C# only generated for methods inside the same class
Merge pull request #179 from jwakely/patch-2

Fix typo
Fixed windows compile issue for is_neutral
Merge branch 'master' of github.com:doxygen/doxygen
Added build support for Python3+ and Python2.6+
doc/translator.py -- unification for Python 2.6+ and 3.3+ (not finished)
Merge branch 'master' into devel