Cleanup sequencers merging in ComponentAccumulator
We ave some historical code related to sequences handling in CA. This MR get's rid of most of it.
- the moveSequence is removed as it was not used
- the addSequence does not allow for the new sequence to have algorithms as this is usually faulty use (one use was corrected)
- the mergeSequence innser fucntion was simplified knowing that the other sequences are arelready inside of the CA
Typos were fixed and docu improved in places. FI @wlampl & @ponyisi