Previous in Series and Next In Series links

@alexandros
This doesn’t work as it displays a link to the next post under the section, which in the documentation is defined as the top level folder directly under content:

.
└── content
    ├── post
    |   ├── firstpost.md       // <- http://1.com/post/firstpost/
    |   ├── happy
    |   |   └── ness.md        // <- http://1.com/post/happy/ness/
    |   └── secondpost.md      // <- http://1.com/post/secondpost/
    └── quote
        ├── first.md           // <- http://1.com/quote/first/
        └── second.md          // <- http://1.com/quote/second/

In this case, post and quote are both sections.

However, my content tree looks like this:

.
└── content
    ├── blog
    |   ├── firstpost.md       // <- http://1.com/post/firstpost/
    |   ├── happy
    |   |   └── ness.md        // <- http://1.com/post/happy/ness/
    |   |   └── stuff.md        // <- http://1.com/post/happy/stuff/
    |   └── secondpost.md      // <- http://1.com/post/secondpost/
    

And I only want the links to show up on ness and stuff pages, and they only have links to posts under “happy” but that is considered the “slug” and not a Section. So basically you need a .NextInSubSection, or .NextInSlug variable.