refs #9022 Reverting CheckWorkspacesMatch to division under fabs

Somebody did a good job making this algorithm look nice but useless, so I spent long time looking in amazement why workspaces which look identical do not match.
A coordinate (and sometimes signal and error! can be negative!) This fixes this problem.
refs #9022 No, this actually fixes negative values problem
refs #9022 Proper error estimation

Evaluating problem I am having comparing two similar inelastic workspaces I've modified comparison algorithm to work with relative and absolute error. This is actually what you want comparing two workspaces and some kind of this approach was already in place for values close to 0
refs #9022 after some thinking, I've decided that standard definition

of Relerr with more careful treatment of values near 0 is preferable implementation.
refs #9022 A simple comment
Merge branch 'feature/9022_serialWorkspaceComparison' into develop