* helm-ring.el (helm-c-source-mark-ring): Simplify, remove `ignore-errors' which seems unuseful here.
* helm-info.el (helm-c-define-info-index-sources): Don't prefix sources with "helm-c-".
Replace "helm-c-" prefix by "helm-" in all files.
* helm-aliases.el: New load all helm obsoletes aliases.
* helm-config.el: require it.