[FIX] Fixes traversal with long context size.
[FEATURE] Integrates block-wise update of the journaled set within the traversal.
[COMMENT] Removes commented unused code.
Merge remote-tracking branch 'origin_github/feature/jst' into sandbox

Conflicts:
	extras/include/seqan/journaled_string_tree/journaled_string_tree_adapter.h
	extras/include/seqan/journaled_string_tree/journaled_string_tree_traversal.h
	extras/tests/journaled_string_tree/test_journaled_string_tree_traverse.h
minor fixes