0.13 Release for DataLad 0.13

This handbook release matches today's DataLad 0.13 release.

With contributions from Dorian Pustina, Sarah Oliveira, Tristan Glatard,
Hamzah Hamid Baagil, Giulia Ippoliti, Yaroslav Halchenko, Alex Waite,
Dorien Huijser, and Michael Hanke -- thank you!

Refactoring or deletions

• RF: Replace datalad publish with datalad push #412
• RF: The Basics part was split into a Basics and Advanced part #450. The
  chapters "Advanced Options"
  and "Go big or go home"
  have been moved/added there.
• Installation instructions for Windows subsystem for linux have been removed #397

Additions

Introduction

• Installation instructions for rpm-based Linux distributions were added #435
• A "user-type" overview now serves as a guide through the handbook #403

Basics

• A stand-alone section
  on datalad push summarizes all previous publishing-related information #417
• A section for collecting gists (nifty code snippets for various tasks) is added to the
  chapter on help#445
• datalad drop is introduced in the first chapter #463
• Gin's new feature of anonymous read-only access to datasets is
  now mentioned in the chapter on using
  third party infrastructure #456
• The section on getting help
  started to collect and explain common warnings and error messages #418

Advanced

• A new chapter on scaling up with DataLad was added #414
• A section on configuring custom data access was added to the chapter
  "Advanced Options"#440
• The extension overview
  has been updated to a complete overview #477

Usecases

• A new Usecase
  Scaling Up: Managing 80TB and 15 Million files from the HCP release
  was added #225
• Giulia Ippoliti contributed the Usecase
  Using Globus as a data store for the Canadian Open Neuroscience Portal
  (opened in #421, merged as #479

Miscellaneous additions

• Introduction of a system to improve intersphinx linkage between the handbook
  and the technical docs & docstrings of DataLad #377
• Various improvements to the PDF version of the handbook #367
• Major toctree restructuring: Chapter-wise toctrees #367, robustified URLs #457
• Addition of short, README-ready explanations of DataLad datasets for published projects #370
• Redirections are now possible, using a ?<label> element after handbook.datalad.org/r.html #518
• (Almost) complete correspondence between HTML and PDF part, chapter, and section labeling #500