Clean up BNormData class (helper class of THaNormAna)

Replace the various parallel heap arrays with a single member structure.
THaNormAna itself could probably be cleaned up as well.
Fix slightly buggy THaPrintOption::operator=

Parse() results was not reset when assigning to null pointer or empty string.
Also, remove assignment to (and dependence on) const TString& since TString
casts itself to const char* in current versions of ROOT.
Renamed SConstruct.py to SConstruct

This is actually the standard way to do things with SCons. Using the soft
link from SConstruct to SConstruct.py was causing 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.

(Contributed by Ed Brash.)
Add README files and modify .gitignore for Eclipse

(Contributed by Ed Brash)