Add README files for Eclipse, plus modify .gitignore to include Eclipse config files.

I also changed the soft link called SConstruct to be the actual SConstruct file, and removed SConstruct.py.  This is actually the standard way to do things with SCons.  Using the soft link was causing some problems when cloning from within Eclipse.  I added some directives to SConstruct so that most editors (emacs, vim, in particular) will recognize it as a python script, and do appropriate syntax highlighting.

I also removed Bob's oodecoder stuff from this branch (I am keeping it in my own private branch for now).