Major update, lots of changes, fixes and performance improvements

• Set search focus, omitted pager when less than 2 pages are present.
• Added search-bar config. Fixed some config entries.
• Added google authentication.
• Added auth-n persistence.
• Added NoCache page instruction.
• Performance improvements.
• Added configurable page cache time.
• Added wiki statistics admin page.
• Changed default auth scheme.
• Added emoji support. ??
• Safer, saner database update.
• Added page comments support.
• Added optional comments to pages.
• Added public user profiles with recently modified lists.
• Added page last modified links.
• Added lite wikifier for comments and bios.
• Added moderation permission for deleting non-owned comments.