This prevents errors about the missing README.  It also suppresses creation of
the standard INSTALL document, which is long and fairly useless.

This will cause GitHub to render the Markdown syntax.

This reverts commit 9e696d9b.

This server is now incompatible with older clients and vice versa.

Add changelog entry

configure.ac: Quote macro arguments

Signed-off-by: Anders Kaseorg <andersk@mit.edu>