Allow API results to wrap long lines

- Bug 260 provides potentally relevant discussion
  (also eventually settled in white-space:pre-wrap)
- Wrapping isn't applied in help pages, since they rely
  on the monospaced font for layout purposes.
- Rename $isError to the more exact $isHelp
- Update documentation for ApiFormatBase::initPrinter()
- Bonus: header w/ info about output formats won't show
  for action=help anymore (irrelevant)

Change-Id: Id9cdf102e17b4c3eaf4b10f3e3f5e97233911b97
Merge "Allow API results to wrap long lines"