closes 78 sort columns

[manuel1618]

This is far from ready but i need to document a few things and the best place for this is the PR

[manuel1618]

The problem I have right now is, that it has become slow. Really slow. Especially the force and moment sorting is a pain in the butt.

Things I would like to condsider:

• Improve the fetch method. It must be fast, as fast as possible. I cannot sort it everytime i fetch.
• Maybe safe state in order to retrieve them if i have sorted it already? This drives me nuts.

Another issue:

• right now the force is calculated two times. One time when i want to sort by force / moment and another time when i add the node lines to the list.
• why? Well sorting calc seems obvious but the value for the force depends on the subcase. I could maybe write a dict with subcaseid to force into the nodeDBModel to solve this? This way, the addNodesToTable JS can just take it from the model - Moving the logic into the backend would be not the worst idea.....

I also have 2nd thought on the whole nodes page.

another issue: if i filter nodes, the sorting does not work at all.... so backend logic is broken right now too.