Revised and extended metrological streams

Feature

• MetrologicalGeneratorAgent: Rewrote to default metrological generator agent for both streams (52606d7)
• SineGeneratorAgent: Added default sine generator agent to metrological_agents.py (54f4035)
• multiwave_generator: Multiwave generator added to metrological_streams.py (682a5ff)

Documentation

• tutorial_7: Introduce tutorial 7 into ReadTheDocs (01d7e44)
• tutorial_default_generator: Add a tutorial for a generic metrologically enabled agent (7bebef1)

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