Migration script to make DB compatible with API, update cluster status

vpsAdmin is not yet adjusted to changed DB layout, will not work
properly.
Locations: remove deprecated columns
Locations: add domain, fix location list
Nodes: adjust settings update
Storage: adjust roots, exports and mounts

storage_root.type renamed to storage_layout
storage_export.type renamed to data_type
vps_mount.type renamed to mount_type
Templates: remove column specials
Vps references to DNS resolvers by ID

Removed vps_nameserver, created dns_resolver_id instead.
Fix node picking, create schema migrations for the API
Merge branch 'devel'
Transactions: fix input/output formatting, handle HTML entities
Merge branch 'devel'