resolves the error of unbalanced tags opened/closed in docbook output: parser error : Opening and ending tag mismatch: para line 358 and tbody

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.

amendment for switching between drives and flipping back to initial cur dir at end of make.bat