Print configured queue members in verbose validation.

This is useful to confirm that nested family names are substituted
correctly in the queues.
Got incremental make working for document generation.
Typos.
Updated .gitignore for doc directory
Merge pull request #236 from hjoliver/update-dot-gitignore

Updated .gitignore for doc directory
Merge pull request #235 from hjoliver/doc-make-incremental

Got incremental make working for document generation.
Merge pull request #233 from hjoliver/verbose-validate-queues

Print configured queue members in verbose validation.
doc only: logging and state dumps now in site/user config
doc only: some [cylc] section heading levels corrected.