Formatting improvements

[simonharris]

ERROR: /Users/simon/project_git/safecracker.pl/api/prolog/tests/test_parser.pl:54:
ERROR:     test preprocessing:text_preprocessing_either_brackets: failed
[plunit_assert] Output does not match expected: expected [[either,the,first,or,third,not,both,is,a,factor,of,20]], got [[either,the,first,or,third,(not,both),is,a,factor,of,20]]

• error should be flagged as such, ie. red, not purple
• perhaps split 'expected' and 'got' onto their own lines

[simonharris]

The branch pa-examples-045-01 contains this example.