fixes #1840 Only show the help button if a help page exists

refs #1843 normally facts base hash has no certname.

this will make sure we don't fetch the wrong host (without a certname) by mistake.

fixes #1849 - Add the current hostgroup name when editing

make sure user expire when editing the user or when logging out

minor SQL improvments

refs #1843 - adds missing lookup

fixes #1843 - Accepts a plain hash as facts source

Reformatted the 'all puppetclasses' page linked to from hosts

minor view improvments to vmware

- adds a console link to all vms
- adds a minimal vm details view

fixes #1842 - Getting hostgroups via the API takes an eternity.

This changes a bit the API resonspe as well, as it makes little sense in a rest
context to return full nested objects (when the child objects can be very large).

therefore, instead of environments and puppetclasses (and eventually smart vars)...