[BUGFIX] Return configured paths on demand, limit possible Exceptions
[TER] 1.1.1
[TASK] Let FluidPages add colPos list item -42

For a while still, Flux won't be able to add this value itself and will live with an "INVALID VALUE" message. However, when EXT:fluidpages is installed the item is easily filled in.
[BUGFIX] Don't force type of argument in colPos list items hook method

I know - this is a potential fugbix (a bug fix which just introduces another problem). However, since the variable is never used, the type is irrelevant - if there are no warnings about interface compliance, of which there were none.
[BUGFIX] Restore BackendLayout processing

By accident disabled and committed. Damn my tired eyes.
[TASK] Use page configuration variables when getting Grid

This allows the BackendLayout to be fully dynamic based on variables configured in the page template.
[BUGFIX] Add colPos -42 when post processing selector options

Instead of always adding -42 as colPos value, it's better to only provide this option when editing a content element, as an option in the colPos selector element.

Fixes: #4
[TER] 1.1.2