Merge pull request #129 from randen/new-build

Patches for moving Windows RC1 to RC2
remove old src tree
added notes about cabal's package layout

also included a dump of the cabal default config
add a Posix generic build that makes a bindist tarball with an activate script
support --prefix command line option
support for building hptool under ghc 7.4 / base 4.5.0.0
updated readme
notes and license update
xhtml comes from GHC bindist

also small clean ups