Add k_line_density

Nathan Daelmanrequested to merge
1239-add-k-point-density into develop

Add k_mesh subsection to results and equip it with line_density, which computes the lowest of all k-points samplings per unit of reciprocal axis (as discussed in #1239 (closed)).

Closes #1239 (closed)

Closes #1191 (closed)

Edited by Jose Pizarro

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