Merge pull request #1315 from oemof/fix/float_fakesequence-might-retu…

…rn-non-floats

Fix casting _FakeSequence to number

Merge pull request #1312 from oemof/feature/fake_sequence_logic

Add logical operators for _FakeSequence

Merge pull request #1305 from oemof/feature/FakeSequenceArithmetic

This implements arithmetic operators (+, -, *, /) for _FakeSequence. In the process, we decided that it would be clean and more understandable if the _FakeSeuqence does not have a state (lenght defined or undefined)  but always has *every* length. All other changes are just to align to this change.

We also removed the keyword coefficients from OffsetConverter. The keyword was about to be removed anyway as it was superseded by the combination of normed_offsets and conversion_factors already in solph 0.5.3, so we decided to skip adapting it.

Merge pull request #1287 from oemof/revision/clean_fake_sequence

Revision/clean fake sequence

Merge pull request #1284 from oemof/release/v0.6

Release/v0.6

Merge pull request #1262 from oemof/release/v0.6

Release/v0.6.3

Merge pull request #1251 from oemof/release/v0.6

Release v0.6.2

Merge pull request #1239 from oemof/features/streamline-results-api

Merge streamlining the `Results` API into `dev`

Merge pull request #1231 from oemof/fix/inconsistency-custom-attribut…

…es-properties

Harmonise usage of "custom_..." keywords

Release v0.6.1

Merge pull request #1228 from oemof/release/v0.6