Help: Add notes about relocatability of config-file packages.
Help: Link to CMAKE_POLICY_DEFAULT_CMP<NNNN> in policies manual.
Merge topic 'extend-docs'

2f15a07 Help: Link to CMAKE_POLICY_DEFAULT_CMP<NNNN> in policies manual.
bb8bde3 Help: Add notes about relocatability of config-file packages.