Reorganize the Installing and Setting up Related Software

The Installing and Setting up Related Software page should be reorganized to describe the installation of all required software on each OS, instead of describing each software and inside it the different OS.
Page structure would be:

1. Intro (leave as it is) - no title
2. Installing on Linux
   (one line)
3. Installing on Mac OS X
   • OpenOffice/LibreOffice and pdftohtml
   • ImageMagick
   • ffmpeg
   • Gimp and UFRaw
     Missing instructions
   • libwpd
     Missing instructions
   • Ghostscript
4. Installing on Windows
   • OpenOffice/LibreOffice and pdftohtml
   • ImageMagick
     Missing instructions
   • ffmpeg
   • Gimp and UFRaw
     Missing instructions
   • libwpd
     Missing instructions
   • Ghostscript