FreeNAS Code

several changes to the treemenu so we can support hook of plugin items

- change attribute of url path to pen from "view" to "url"
- change the gname attribute so it is autogenerated from the position of the tree
- e.g. UPS node under Services is called "services.UPS"
- add a simple method to catch new items from an url (plugin)
- the url must return a JSON array containing nodes for the tree
- the node can be appended anywhere in the tree:
- e.g. "append_to": "services.Rsync.RsyncMod" will append it to Rsync Modules node
- split auto_generate in two
- prepare_modelforms go through all the models and find all related modelforms
- generate actually generate the menu structures to dump as JSON later on

fix blocks for i18n

Promote feedback to trunk.

REmove unused imports

remove tons of unused imports and unused variables

Roll up commit from ix repo

sync up with internal repo, add support for ZFS cache, log, spares, clean up GUI

Sync with ix repo r1697, fix numerous bugs, enable treemenu, turn on mps