[cleanup] Remove base_array and base_array_window.

Jö Fahlkerequested to merge
remove-basearray into master

These classes are internal to ISTL and used nowhere in ISTL.

Note: base_array_unmanaged is used internally by BlockVector, Matrix, and VariableBlockVector and is thus not removed.

Intent-to-merge: 2018-05-23.

Edited by Jö Fahlke

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