Re #6709 several algorithms changed to new format
Re #6709 load algotithm added as a no sig section
Re #6709 the rest of the algorithms
refs #6709. Adapt wiki_maker for usages.
Merge branch refs #6709 'feature/6709_custom_usage' into develop

Conflicts:
	Code/Mantid/Framework/Algorithms/src/Rebunch.cpp