Bug 589707 - Flex .rule file for Visual Studio build can't cope with spaces in filenames

Adjusted the rules files and where and the vcproj file so it can handle paths with spaces as well.
When generating the documentation (Cygwin) a small problem appeared in a Makefile when there is a space in the path, this is solved as well.

Tcl: collect XRefs also if INLINE_SOURCES = no

- Open() replaced by xopen() that internally uses the encoding argument
  only for Python 3. The earlier usage of the codecs module and of the
  prefixed unicode string literals was removed.
- Some lists of prototypes were sorted to get the same translator report
  for different versions of Python.
- The local dedent() definition was replaced by textwrap.dedent().
  (The older versions of Python did not have the module.)
- Tested on Windows for Python 2.6.0, 2.7.7, 3.0.1, and 3.4.1.

Fix typo

\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 unnecessary rules for FORTRAN user defined types

Fix description of USE_PDFLATEX

Added documentation for some missing HTML commands

Added documentation for H4, H5 and H6 command to be complete and extended IMG description a bit

The tag is USE_PDFLATEX, not LATEX_PDFLATEX

make.bat: change current directory

Removed not implemented HTML commands from documentation

This concerns the BODY and MULTICOL tags.

- it failed when one of the doxygen.exe was not present

added reset of var Dir_Old at the end.