Improved build scripts.

The scripts now have more sensible names, and the code is better factored.

dist/releasescript

@@ -0,0 +1,43 @@
+#!/bin/sh
+
+BUILDER=./build-arch-tag
+
+# Check whether the tag exists
+TAG=$1
+if [ "x$TAG" != "x" ]
+then
+	FOUND=`git-tag -l $TAG`
+	if [ "x$TAG" = "x$FOUND" ]
+	then
+		echo "Tag $TAG found."
+	else
+		TAG=""
+	fi
+fi
+
+if [ "x$TAG" = "x" ]
+then
+	echo
+	echo "Scyther binary distribution generator."
+	echo
+	echo "  Usage: $0 <tag>"
+	echo
+	echo "Don't know tag $TAG, please select one from below:"
+	git-tag -l
+	exit
+fi
+
+# Determine system and build accordingly
+OS=`uname -s`
+if [ "x$OS" = "xDarwin" ]
+then
+	$BUILDER mac $TAG
+elif [ "x$OS" = "xLinux" ]
+then
+	$BUILDER linux $TAG
+	$BUILDER w32 $TAG
+else
+	echo "Don't know architecture $OS, where am I?"
+	exit
+fi
+