Reviewed docs on operators, library, sugar. Fixed bug in makeOp due to the recent BlochdiagonalOperator interface change

Commit a141d2bf "resolve degenerate use of 'mode' in OperatorAdapter
and LinearOperator" was pushed without ensuring consistency with
other operator definitons and correct exception strings. This commit
aims to resolve this.

The argument variable of _flip_modes(…) is now always called 'trafo'
and the Exception thrown for invalid values of it is
ValueError("invalid operator transformation"). To aid readability,
numerical constants were replaced with correspondingly named
constants (ADJ, INV).

- moved draw_sample() and inverse_draw_sample() to EndomorphicOperator
- inverse_draw_sample() is always possible if draw_samples() is implemented (see EndomorphicOperator)
- changed WienerCurvature draw_sample() to probably better version
- implemented both functions in DiagonalOperator and ScalingOperator properly (i.e. check for positive definiteness)