[!149] [bugfix] Fix bisection loadbalancing algorithm

Merge branch 'fix/issue51-loadbalancer' into 'master'

ref:staging/dune-uggrid ebf74cbf replaces three sort functions by a template. However, the template arguments were never used in the function, so we only sorted in one coordinate direction. This commit fixes this by replacing the hard-coded indices with the template argument values.

Thanks to Leopold Stadler for finding the offending commit.

• Should be backported to the release/2.7 branch.

Fixes #51

See merge request staging/dune-uggrid!149

Closes #51 (closed)

(cherry picked from commit 3865fe02)

105df623 [bugfix] Fix bisection loadbalancing algorithm

@gruenich , is this okay?

merged

mentioned in commit fb1e5072