correction about LD_LIBRARY_PATH in README

mention that this is necessary if --link-static was not used
improved documentation of Accumulator
fixed typo in MeritCombiner docs
removed unused NTL code
fixed package directory structure in README
improved presentation of waf options in README
removed todo from main.dox

Was about adding reference to published paper: a link to the paper on Pierre
L'Ecuyer's web site is now given.
added header and dox as deps for Doxygen target
fixed default weights in web ui
improved not about CS: in quantiles.cc
clarified powerScale argument in Weights::parse*()
clarified norm and weights in figures of merit
documented WeightedFigureOfMeritEvaluator
changed default powerScale to 1 in Parser::Weights
removed erroneous weight scaling in correlation.cc
converted latcommon \todo's in \note's
documented Digits
run Doxygen from root of source tree

This fixes the file path in the comment:
"The documentation for this class was generated from the following file…"
added example for IndexMap
documented IndexMap usage