Revert "finished "System maintainance" section in doc/COMP4.lyx"

This reverts commit a10d1d3f190a05e63364b699e345b9ddf2b0404a.
Revert "Reformatted tabs/spaces"

This reverts commit 7d41794bfd22755ba5552b93e44beceb2ae80afe.
Added testing section