Installation methods

Conflicts:

	MANPAGE.md
New 'list-actions' internal option

Conflicts:

	devtools.sh
WIP
WIP with PBL 2.0-alpha

Conflicts:

	dev/manpage.back.sh
	devtools-actions/sync.sh
Updating the whole thing for PiwiBashLib 2.0-beta

Conflicts:

	devtools-actions/sync.sh
WIP: adaptation to PiwiBashLib 2.0

Conflicts:

	TODOS.md
Pre-tag-hook review
Creation of a ChangeLog file