Add script to upgrade to db v4
Merge branch 'branch/canto-rename'

Renamed everything from "PomCur" to "Canto".
Document using VirtualBox and Vagrant for Canto
Fix type pomcur is now canto
Fix doc formatting and explain vagrant better
Link to the documentation page from the docs
Fix description of manual installation
Fix Markdown indentation problems
More formatting fixes for the documentation
Rearrange installation section
Remove unused /test_curs path and configuration
Add a title to the external links
More documentation for configuration options
Fix syntax of URLs so they're rendered as links
Add instructions for installing CLucene on Ubuntu
Install local::lib with apt-get on Debian/Ubuntu
Tidy heading
Improve CPAN instructions
More detail about starting a test server
Mention that Bundle::CPAN is slow to install