GitLab

Where applicable, use a ScalingOperator instead of a DiagonalOperator.

Instead of validating the input via `assert`s in user-accessible
functions, raise appropriate errors.

Instead of drawing samples and storing them in a potentially huge list,
draw individual samples only when needed. Hereby, get rid of the
`_stats` function but instead draw samples during computing the
statistics summary.

Allow for specifying either a Field/MultiField or a float as an offset
for the correlated field during `finalize`.