Switch out xml.etree for defusedxml

[Ed McDonagh]

https://pypi.org/project/defusedxml/#defusedxml

Will remove the security errors Codacy complains about

[Ed McDonagh]

Test added to check XML extraction is taking place, before refactoring that section. Refs #735

→ <<cset 3955b554e953>>

[Ed McDonagh]

Switched to the more secure defusedxml. Tightened up except, added debug log, added test. Refs #735

→ <<cset 018166a01c37>>

[Ed McDonagh]

Adding ref #735 to comments

→ <<cset ac9d0fe3b410>>

[Ed McDonagh]

Removing unnecessary pass statement. Refs #735

→ <<cset 6cd1781e1561>>

[Ed McDonagh]

Removing another unnecessary pass statement. Refs #735. Thanks Codacy!

→ <<cset 3bcda5ffeef7>>

[Ed McDonagh]

Merged in issue735switchXMLparser (pull request #291)

Fixes #735

→ <<cset 632bd5ec883b>>