Fix import of subGuideTree in align/sca.py.
Fix import of matrix2dst in basic/ops.py
Fix sqrt invocation in compare/_phylogeny/polygon.py.
Remove usage of undefined function 'FileWriteMessage' as logging output.
Remove usage of undefined self in plot_concept_evolution function in convert/plot.py.
Fix import of regex library in convert/strings.py.
Fix LoadTree invocation in convert.tree.py.
Fix import of scorer2str in data/dervive.py
Fix typo in documentation of get_sublist.
Fix Exception handling in function read_qlc in read/qlc.py
Simplify LoadTree.

This takes into account that only the newick format is supported.
Additionaly add python3 compatibility definitions for cmp and reduce.
Fix broken imports.

This bug was recently introduced with 5291156
Fix missing import.