Make all tests static void

This removes the need for tests.h to have all tests listed
Change the way R/W modes are specified in qes_file
Reformat ZFILE macros in qes_config.h.in
Partial review of qes_util module

- Remove likely/unlikely macros & tests
- Rename macros so they mostly start with QES/qes
- Whitespace re-formatting of source
Rename test_zfile->test_file to match module name

No code changed