remctl 2.1

I was going to wait for the first wallet release to do more remctl work, but having make check not work if builddir != srcdir would cause Quanah to complain when building it for pubsw. Since Ralf Wildenhues did a bunch of checking for me to be sure the latest Automake would work correctly (much appreciated!) and commented on this, I went ahead and fixed it.

I also modified the remctl server to set REMOTE_USER (the same as REMUSER), REMOTE_ADDR, and REMOTE_HOST (if available), which exposes some more interesting information that I'll need for the wallet server and which should make libraries that run in CGI environments happier.

You can get the latest version from the remctl distribution page.