Fix handling of relative paths in suite files and Added CDATA to 6.2.5 sample XML

This pull request is now tracking two main sets of changes:

1. Fix handling of relative paths in suite files: Ran into this the other day trying to organize my suite xml files.

2. Added CDATA to 6.2.5 sample XML: (2 years old pull request) Got a bug from someone the other day saying testng-plugin for jenkins was not working after they copied over the example to create a test report.