Fixed something forgotten in 2812aa070d8e5a4502f667dfae6dd6b9948ddef5.
Refactored index generation code so that similarities and differences between tags.py and indexes.py are more obvious.
Added new option INDEXES_PAGES_STARTING_WITH_LAST.
Continued refactoring indexes.py and tags.py so that most of the code is quite identical, and can be moved into a common utility function soon.
Moved index generation code into Nikola class.
Renamed option to INDEXES_PAGES_STATIC.
Created utility function to adjust path/link names for indices.
Added option to inject more uptodate dependencies.
Improved documentation.
Moved more config code into generic_index_renderer.
Fixed missing argument.
Added new option ARCHIVES_ARE_INDEXES which allows to render archive post lists as indexes.