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

I have no idea why we had a MF exclusive to edit file extent, so merge them.
If the extent size is set to auto (0), make sure the file exists.

Proper-case FTW! Thanks matto :)

add icons and clearer labels for rsync, cron, and smart. added TM symbol to FreeNAS.

enable UPS in GUI

fix delete for iscsi zvol and anv filter

group rsyncd and rsyncmod in services.Rsync tree

add custom view all for rsync modules

fix blocks for i18n

move final bits for cronjob from services to system