Convert FORTRAN modules to namespaces

This helps fix linking issues and ambiguity related to the difference between classes and modules in FORTRAN 2003+.
Fix rules for closing FORTRAN module and typedef scopes
Remove filtering rule when generating FORTRAN module links
Add source code possibility for RTF output

Analogous to Latex and HTML output the possibility to have source code shown in RTF output is created.
Based on question: http://doxygen.10944.n7.nabble.com/RTF-lack-of-source-code-tc6936.html
Fixed typos in C/C++ comments. There are no functional changes.
  fix docbook output
    1. support other than english
    2. fix broken example link id
    3. fix incomplete TOC : no Classe etc.
    4. add brief description for Functions etc.
    5. Comply with REPEAT_BRIEF
    6. Do not output duplicated contents when detailed descripton is missing.
    7. set table colwidth for Param/RetVal
Merge pull request #260 from zmhuang/master

fix docbookgen.cpp to support other than english
Merge pull request #267 from orbitcowboy/master

Fixed typos in C/C++ comments. There are no functional changes.
Bug 741417 - Crash when building gtkmm documentation
Merge branch 'master' of github.com:doxygen/doxygen
Update README.md
Bug 740218 - Full scope needed when making link inside cross-referenced section (fixed regression)
Fixed issue parsing @end directly followed by the end of the file
Bug 704090 - Allow Class{T}.Method in cref to refer to a generic class in XML comments
Bug 735584 - Reached end of file while still insided a (nested) comment in Markdown
Bug 738167 - Entity references in XML command attributes are incorrectly handled
Merge pull request #247 from hansec/FORTRAN_moduleNS

Convert FORTRAN modules to namespaces
Merge pull request #264 from albert-github/feature/bug_rtf_source

Add source code possibility for RTF output
Supporting linking for methods bound to FORTRAN classes in source definitions
Merge pull request #268 from hansec/FORTRAN_link_bound_methods

Supporting linking for methods bound to FORTRAN classes in source definitions