Ignore suite and section IDs in JUnit report

[d-rede]

Issues being resolved:

• https://github.com/gurock/trcli/issues/71
• https://github.com/gurock/trcli/issues/111

Solution description

• The id properties in testsuites and testsuite elements are no longer added to sections
• Note: To select a suite in a multisuite project, always use the --suite-id command line option

PR Tasks

• [x] PR reference added to issue
• [x] README updated
• [x] Unit tests added/updated

[Testinator-X]

https://github.com/gurock/trcli/issues/71 still doesn't work