Fix up proofs after word lemma moves

globally use session-qualified imports; add Lib session

Session-qualified imports will be required for Isabelle2018 and help clarify
the structure of sessions in the build tree.

This commit mainly adds a new set of sessions for lib/, including a Lib
session that includes most theories in lib/ and a few separate sessions for
parts that have dependencies beyond CParser or are separate AFP sessions.
The group "lib" collects all lib/ sessions.

As a consequence, other theories should use lib/ theories by session name,
not by path, which in turns means spec and proof sessions should also refer
to each other by session name, not path, to avoid duplicate theory errors in
theory merges later.

Isabelle2017: update AInvs for RC0

* word_eqI is no longer rule_format.

* Updated Isabelle/ML Thm.join_proofs to Thm.consolidate.

* Updated suffix_refl to suffix_order.order.refl.

* Removed some lines of proofs, thanks to improved simplifier.

arm-hyp ainvs: update lookupPtSlot

arm-hyp: AInvs down to detype

changes after rebasing (for isabelle2016-1 and the new wp)

arm-hyp invariants: fix arch_splitting/locales

* tcb_arch_ref: definition and invariants (to access obj_refs in tcb_arch in generic contexts)
* fixes related hyp_refs

arm-hyp invariants: changes from rebase for ARM_HYP invariants

arm-hyp invariants: updates for vcpu, alignments, valid_vspace_obj, wellformed_arch_obj, etc.

arm-hyp invariants: copy arch-splitted invariant files from ARM

earlier updates in ArchInvariants are kept

arm-hyp invariants: add ARM_HYP directory, updating ArchInvariants_AI and Invariants_AI