[dev] Support easy testing of addons for wacoq as well.

The script has been renamed `adopt-addons`, because "consume"
sounds a bit harsh.

etc/consume-addons → etc/adopt-addons

 #!/usr/bin/env node
 
 /**
- * Useful for development: installs or links addons from a given directory.
+ * Useful for development: creates links to addons from a given directory.
  */
 
 
@@ -10,15 +10,15 @@ const fs = require('fs'),
       glob = require('glob'),
       mkdirp = require('mkdirp');
 
-const DEFAULT_CONTEXT = 'jscoq+64bit';
+const DEFAULT_CONTEXT = 'jscoq+64bit', DEFAULT_SCOPE = '@jscoq';
 
 const opts = require('commander')
-    //.option('-l, --link', 'create symbolic links instead of copying')
     .option('-c,--build-context <switch>', 'Dune context to look in for build artifacts', DEFAULT_CONTEXT)
+    .option('-s,--scope <name>', 'NPM scope for packages', DEFAULT_SCOPE)
     .parse();
 
 const pkgDir = './node_modules',
-      pkgPrefix = '@jscoq/',
+      pkgPrefix = opts.scope.replace(/^([^@])/, '@$1').replace(/([^/])$/, '$1/'),
       buildRel = `_build/${opts.buildContext}`;
 
 function consumeFromDirectory(dir) {
@@ -33,7 +33,7 @@ function consumeFromDirectory(dir) {
         }
 
         if (manifest.name.startsWith(pkgPrefix)) {
-            var source = path.join(buildRel, pkgDir, manifest.name),
+            var source = path.join(cd_maybe('.', buildRel), pkgDir, manifest.name),
                 target = path.join(dir, path.dirname(fn));
             console.log(`${manifest.name}  -->  ${target}`);
             mkdirp.sync(path.dirname(source));