Add paragraph about Ice 3.5 server not supported under Windows
Add note about Windows Ice 3.5 clients
Improve description of Ice 3.5 limitation
Fix minor points from PR review.
Add section on -DMARK build option.
Redirect tablestest/ source link
Convert link to components/specification using the file markup

Since components/specification is generated at compile time and does not
exist under GitHub, using a sourcedir extlink will create a broken link.
Merge pull request #543 from sbesson/rebased/develop/ice35_windows

Add paragraph about Ice 3.5 server not supported under Windows (rebased onto develop)
Merge pull request #547 from sbesson/rebased/develop/broken_source_links

Redirect tablestest source link (rebased onto develop)
Merge pull request #544 from ximenesuk/clarify-pytest-fixes

Clarify pytest fixes and additions (rebase)