Import pandoc/markdown files
Update build system
Ensure all files are packaged

Also add a helper script to compare checked-out to distribution tar-file
Detect pandoc and allow user to set options

Also include a script to help building from the git repository
Make pandoc a requirement
Add a requirement for pandoc version
Fix error in Makefile
Check that all pandoc output formats are produced
Update minimum version

PDF internal links are broken in 1.9.1.1
Fix install of manpages
Reorder date/version stamping in processing
Create a single pandoc post-processor
Additional cleanup
Update manual maintenance readme and make it pandoc
Fix typos
Updates to benefit the website
Merge branch 'pandoc'

Replace docbook documentation with pandoc-flavour markdown.
See doc/README.md for more information.