Update to clang-format-5 and reformat the codebase 

re #15289

and use in CheckWorkspacesMatch

Refs #11179

The converted text is stored in separate .rst files in the docs directory.
Refs #9562

nof if I am familiar with this style or finding it clearer then usual file scope function.

Refs #9252

of Relerr with more careful treatment of values near 0 is preferable implementation.

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

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.

by removing references to POCO methods which do not exist on Unix

by prohibiting parallel execution for CheckWorkspacesMatch in one selects "debug" and "trace" log levels

Mainly removed Poco includes and used forward declarations instead.
Unsuprisingly this has affected some algorithms.
Refs #8784