Merge pull request #1 from qgis/master

Forked source update request
supporting xelatex PDF output
supported xelatex PDF output for Korean and Hindi
Fix spelling errors in PyQGIS cookbook

Correct mispelled words. Also correct a few other minor typos.
Do not change between US or UK spelling variants, both of which are
used (sometimes in the same sentence).
Merge pull request #238 from sawcordwell/spelling

Fix spelling errors in PyQGIS cookbook
Merge branch 'master' into xelatex
New training forestry module

rst files and images added for first time
some corrections to lidar and maps
updates to forestry files

some more :doc: tags added
Merge pull request #239 from sanak/xelatex

Xelatex support for Korean and Hindi
reviving the next/prev links in the doc webpages
forgot these changes for prev/next buttons...
styling the index page
using new docker image, and removing exited containers
Merge pull request #240 from egonzale/master_forestry

New training forestry module
textual fixes, thanks Kwon Yongchan
fixing not working align directions
script cleanup
Update foreword.rst
Update modeler_hydro_calculator.rst