- Don't insert a space before the output of a process
- To do this, suppress space and quoting on the output, and to do
that move the labeling-output for warnings and errors into
the constructor (so that an idiomatic .nospace() does the right thing).
- Use DebugRow for one-row-at-a-time output with continuations.
- Use DebugList for one-item-per-line with continuations.
- Use DebugMap for one-row-at-a-time output of a QVariantMap.
- Move logging-levels to an enum
- (re-)Order logging-levels so that the normal debug statement is
not the most-important (lowest level).
- Drop using namespace std;
