Update inter-ro.csl

1. For subsequent citation volume must appear only for books.
2. For citation and bibliography: for an edited book, editor appears on the first position, in place of author; for a book with author and editor, editor must appear on another position.
Adds new generated landes dependent styles.
Merge pull request #669 from nturcan/patch-3

Update inter-ro.csl
Updates Landes styles.
add URL and fix in-text sorting for environment and planning.
@rmzelle - there are four journals - A, B, C, D, of this with different ISSNs - how should we handle this? Add all four as dependent styles?
Merge pull request #671 from cpina/landes

Adds new generated landes dependent styles.