Module 7 part 1 update

Updates of module 7.1. following the data used in previous modules and
with some changes due to v2.0.
Module 7 part 2 update
Merge pull request #1 from qgis/manual_en_v2.0

Update link to changelog 2.0
Merge pull request #198 from egonzale/manual_en_v2.0

Updates to module 7 lessons 1 and 2