Test scenarios without annual investment maxima

[jokochems]

Problem description

So far, annual investment limits are imposed per technology to reflect industrial production capacity limitations. They become binding for some scenarios. Now it might be interesting to see whether this leads to a significant bias.

Suggested fix.

Test completely without imposing annual investment maxima by using the respective setting. This should not require any code change and the issue can be closed as soon as the respective optimization runs have been made.

[jokochems]

Since the respective runs have been started (or rather scheduled) and it turned out that they did not require any code changes, this issue can be closed again.