PDFs: Fix mysterious puppetdb 1 manual breakage

GUESS WHAT, the magic string:

-puppetdb-1-install_from_source-html-step-3-option-b-manually-create-a-keystore-and-truststore

...when used as an element ID and then linked to from at least one other
part of the document, will cause wkhtmltopdf to die like a smoking
tape-drive-bedecked computer from the original Star Trek after Kirk
smugly presents it with a logical paradox. Twiddling one character in the magic
ID will fix the problem. WHY? I DO NOT KNOW. THAT IS A VERY GOOD QUESTION.
Some last minute tweaks and additions to request manager stuff.
puppetdb 1: Fix broken link in install from source guide
PDFs: Add Puppet Reference Manual 2.7/3, Hiera, and PE 2.7 to the PDFs
Added new information for package verification functionality in PE 2.7 installer/upgrader/uninstaller.
PDFs: Update all PDFs
Merge branch 'pdf_problems'
One more tweak to request-management page to give Haus an anchor.
Merge branch 'master' of github.com:puppetlabs/puppet-docs
Merge pull request #117 from geekygirldawn/master

Minor changes to Community Guidelines
Added information to PE Console and puppet dashboard pages re: maintaining innoDB to prevent it from becoming too enormous.
Fixes Quick Nav to point at most recent PE manual version.
Small corrections to InnoDB maintenance instructions.
Add 2.7.20 references
pe2.7: Fix broken link on what's new page
Update more PE 2.6 links to 2.7

(Should be the last)
Fix pair of reversed labels in old language guide
PE2.7: Fix typo in node request page
(#17835) Updates to system requirements page for Puppet 3

- be more explicit about what rubies are supported
- indicate that EL5 is only supported on newer rubies like the one we package
  (I could not find a more specific page about enabling the 'dependencies' repo,
  but I hope that's clear from the text here)
- make the links for facter and heira go somewhere instead of rendering as
  empty brackets. it'd be nice if they both went to similar/parallel pages,
  but there's no puppetlabs.com landing page for hiera and no top-level docs
  page for facter, so here we are.
Added "old version" warning to the PE 2.6 docs.