Unbreak app bundling: get package search path right, handle (legacy) bundle-time code load dependencies
do link phase 1 at slice load time
remove internal on_use/on_test backcompat
Merge 'handlebars' package into 'templating' package to avoid having to have a package.js-load-time dependency between the two packages. Remove the hack that we had been using to handle this.
Try to move prelink into packages.js. Almost there -- still need to figure out how to get package search options.
port minor fixes from other experimental branch
Compile packages lazily! Fix bad syntax in appcache.