Add Pan cheat sheet

This is copied from some internal documentation at RAL which looked like it was worth sharing.
Feedback please!
Address comments and add author tag.
Add missing nlist in package architecture pinning example
Initial summary of 17th Quattor Workshop (Amsterdam)
Merge pull request #71 from jouvin/workshop-summary

Initial summary of 17th Quattor Workshop (Amsterdam)
Documentation about Quattor 14.2.1 and YUM migration
Documentation fixes based on concrete experience
Add language guards in instructions as suggested by Luis
Attempt to fix messed up rendering of summary on the web site
Merge pull request #73 from jouvin/workshop-summary

Attempt to fix messed up rendering of summary on the web site
New attempt to fix messed up rendering of workshop summary
Merge pull request #74 from jouvin/workshop-summary

New attempt to fix messed up rendering of workshop summary
Remove extra prefixes

Left over from previous version
Merge pull request #66 from jrha/how-do-i

Add Pan cheat sheet
Quattor workshop summary: fix end-of-lines (Unix rather than Windows)
Merge pull request #75 from jouvin/master

New attempt to fix workshop summary rendering by Jekyll
Use Unix EOL instead of Windows EOL
Merge pull request #72 from jouvin/yum-migration

Documentation about Quattor 14.2.1 and YUM migration
Fix formatting issues (missing new lines)
Merge pull request #76 from jouvin/yum-migration

Fix formatting issues (missing new lines)