…gorand#1010)

- Updates the go-algorand submodule hash to point to rel/beta
- Moves the cpu profiling file, pid file and indexer configuration file
  to be options of only the daemon sub-command
- Changes os.Exit() to be a panic with a special handler.  This is so
  that defer's are handled instead of being ignored.
- Detects auto-loading configuration files in the data directory and
  issues errors if equivalent command line arguments are supplied.
- Updates the README with instructions on how to use the auto-loading
  configuration files and the data directory.