Simplify installation/packaging

Now, each harbour install the files into an overlay structure that could
be directly copied into /uspace/dist. There is no need for the double
copying into apps/misc/... and then into uspace/dist.

Also, as /uspace/overlay exists, the need for uninstallation routine
does not exist anymore.

The change affects all harbours, but the changes usually reduce the
script complexity.
Update readme
Automatic tarball creation
Readme warning
Remove file that is no longer needed
Merge branch 'archive' (harbour tarballs)

The command `archive' allows you to create tarball with files to be
installed into /uspace/dist (/uspace/overlay).