[vala] (9 commits) ...vala: DataType for GLib.Error should be should resolved as ErrorType

[Rico Tzschichholz <ricotz src gnome org>]

Summary of changes:

  6c44fc7... vala: Always analyze nodes after they are inserted into the (*)
  6395a2e... Collect error_types on demand to allow transformations (*)
  1ee72d5... Recurse arguments when getting error types for method calls (*)
  508d5d0... vala: Add missing replace_expression() implementations (*)
  ace0b64... vala: Fix several AST construction/parenting issues (*)
  88ca237... vala: Add source_reference to local variable of catch-claus (*)
  f7232c3... vala: Fix and add more to_string() methods to expressions (*)
  0f373db... vala: Add some missing type copying (*)
  92c0c68... vala: DataType for GLib.Error should be should resolved as  (*)

(*) This commit already existed in another branch; no separate mail sent