Rename the pipeline get() method to execute()

[jesper-friis]

The name of the pipeline get() method creates confusion for two reasons:

• it only activates the pipeline execution, but does not return anything (which the name get kind of indicates)
• it is just too easy to confuse the get() method of the pipeline with the get() methods of the strategies.

Suggestion: rename the get() method of the pipeline to execute().

[CasperWA]

I'm not against this at all. It sounds like a great improvement. I'd like the input of @quaat though.

[daniel-sintef]

I'd rather not: as someone who recently learned otelib, this did not impact me in any way. I think there is a massive cost introducing these backwards-incompatible changes, and the benefit to me seems purely hypothetical.