message: Update of INSTALL
diff: -Building Bitcoin
  +Building Peercoin
  -See doc/readme-qt.rst for instructions on building Bitcoin-Qt,
  +See doc/readme-qt.rst for instructions on building Peercoin-Qt,
  the intended-for-end-users, nice-graphical-interface, reference
  -implementation of Bitcoin.
  +implementation of Peercoin.
  -See doc/build-*.txt for instructions on building bitcoind,
  +See doc/build-*.txt for instructions on building peercoind,
  the intended-for-services, no-graphical-interface, reference
  -implementation of Bitcoin.
  \ No newline at end of file
  +implementation of Peercoin.
  