Clarify the use of the -k option and py.test.
Merge pull request #541 from sbesson/ice35_windows

Add paragraph about Ice 3.5 server not supported under Windows
Fix minor points from PR review.
Add section on -DMARK build option.
Clarifying the top_links examples
Fix indentation under bullet point
Merge pull request #537 from will-moore/web_settings_removal_11559

Web settings removal 11559
Merge pull request #542 from ximenesuk/rebased/dev_4_4/clarify-pytest

Clarify pytest options (dev_4_4)