Support global %maxcore option in the input file generation about aiida-orca HOT 2 OPEN

As far as I remember from the manual, there are ways to define such inputs consistent with the current implementation. I am against having exceptions in the plugin unless the feature is necessary to have and there is no workaround for it.

Let's have a look @danielhollas at the manual and find a solution. Either way, we can have a note in the documentation if needed (possibly adding an example too).

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Back when I was looking into this, the only solution I found was defining maxcore within each method section (e.g. within the tddft block). This works and it is what I use now in my app. The global option would be more convenient, but it is not currently a big priority for me. I agree that having an exception just for this is not great. Perhaps the memory option could live in the settings dictionary? In any case, let's leave this open so that we have this issue documented.

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