add missing guide/install-scripted.md

I mistakenly lost a "git mv easy-install.md install-scripted.md" when
reworking the commit, I suppose.

guide/install-scripted.md

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+# Building and installing Moonfire NVR using provided scripts
+
+This guide will walk you through building and installing Moonfire NVR with the
+provided scripts. You should have already downloaded the source code as
+mentioned in [install.md](install.md), and after completing these instructions
+you should go back to that page to complete configuration.
+
+There are no binary packages of Moonfire NVR available yet, so it must be built
+from source. This is made easy using a few scripts that will do the job for you
+unless you have very a different operating system. The scripts are written and
+tested under ubuntu and raspbian but should not be hard to modify if necessary.
+
+## Setting everything up
+
+Start by executing the setup script:
+
+    $ cd moonfire-nvr
+    $ scripts/setup-ubuntu.sh
+
+If this is the very first time you run this script, a file named `prep.config`
+will be created and the script will stop. This file is where you will set
+or change variables that describe the Moonfire installation you want. The
+initial execution will put default values in this value, but only for the
+most commonly changed variables. For a full list of variables, see below.
+
+Once you modify this file (if desired), you run the setup script again. This
+time it will use the values in the file and proceed with the setup.
+The script will download and install any pre-requisites. Watch carefully for
+error messages. It may be you have conflicting installations. If that is the
+case you must either resolve those first, or go the manual route.
+
+The script may be given the `-f` option. If you do, you are telling the script
+that you do not want any existing installation of ffmpeg to be overwritten with
+a newer one. This could be important to you. If you do use it, and the version
+you have installed is not compatible with Moonfire, you will be told through
+a message. If you have no ffmpeg installed, the option is effectively ignored
+and the necessary version of ffmpeg will be installed.
+
+The setup script should only need to be run once (after `prep.config` has been
+created), although if you do a re-install of Moonfire, in particular a much
+newer version, it is a good idea to run it again as requirements and pre-requisites
+may have changed. Running the script multiple times should not have any negative effects.
+
+*WARNING* It is quite possible that during the running of the setup script,
+in particular during the building of libavutil you will see several compiler
+warnings. This, while undesirable, is a direct result of the original
+developers not cleaning up the cause(s) of these warnings. They are, however,
+just warnings and will not affect correct functioning of Moonfire.
+
+Once the setup is complete, two steps remain: building and then installing.
+There is a script for each of these scenarios, but since generally you would
+want to install after a succesul build, the build script automatically invokes
+the install script, unless specifically told not to.
+
+## Building
+
+The build script is involved like this:
+
+    $ scripts/build.sh
+
+This script will perform all steps necessary to build a complete Moonfire
+setup. If there are no build errors, this script will then automatically
+invoke the install script (see below).
+
+There are two options you may pass to this script. The first is "-B" which
+means "build only". In other words, this will stop the automatic invocation
+of the install script. The other option available is "-t" and causes the
+script to ignore the results of any tests. In other words, even if tests
+fail, the build phase will be considered successful. This can occasionally
+be useful if you are doing development, and have temporarily broken one
+or more test, but want to proceed anyway.
+
+## Installing
+
+The install step is performed by the script that can be manually invoked
+like this:
+
+    $ scripts/install.sh
+
+This script will copy various files resulting from the build to the correct
+locations. It will also create a "service configuration" for systemctl that
+can be used to control Moonfire. This service configuration can be prevented
+by using the "-s" option to this script. It will also prevent the automatic
+start of this configuration.
+
+## Configuration variables
+
+Although not all listed in the default `prep.config` file, these are the
+available configuration variable and their defaults.
+
+    NVR_USER=moonfire-nvr
+    NVR_GROUP=$NVR_USER
+    NVR_PORT=8080
+    NVR_HOME_BASE=/var/lib
+    DB_NAME=db
+    DB_DIR=$NVR_HOME/$DB_NAME
+    SERVICE_NAME=moonfire-nvr
+    SERVICE_DESC="Moonfire NVR"
+    SERVICE_BIN=/usr/local/bin/$SERVICE_NAME
+
+## Completing installation
+
+After the steps on this page, go back to [Downloading, installing, and
+configuring Moonfire NVR](install.md) to set up the sample file directory and
+configure the system.