Update Lab 11 with par2 content (in Publish Mode)

Fix par2 section

Added hint on using --apparent-size to du /etc exercise

Finished incremental tar exercise

Update output

Not actually finished with adding incremental tar and par2 stuff

Renumber sections and add rough tiddlers for PAR2 and tar incremental/differential exercise

Remove references to the Lab VM, tweak tar exercises

Remove old content for Backups lab

Expand wording of differential/incremental backup, fix reference to Nigel's lecture

Remove stray draft file

Renumbered backups tiddlers to 11.5 and linked from main Lab 11 part

Update output for Lab 11

Update instructions for 2022

Moving and updating content for Lab 11, 2022 S2

Add notes for 2023 labs

Add to-do for ML/IA lab

Add workaround for rsample package

Lab 9 output

Add links to Extra for Experts

Fix typo

Update Extra for Experts section

Expanded ML/IA lab

Update SMS spam R code, add CSV

Add R file for machine learning in information assurance lab

Update H2 links

Lab 8

Lab 8

Revise setup instructions

Move database security lab to Lab 08