Make README avail to guest in installation script
Move INSTALL instructions to top directory

- Move INSTALL instructions to top directory.
- Clean up references to files in top directory.
Turn references to README.mk, LICENCSE, etc into regular URL
references to files on the same server rather than RAMP-internal
"document activity" URL's.  With this change, links will work on
GitHub, not just in an installed version of RAMP.
Improve various comments in scripts and settings