Allow null values in XWPFParagraph.get/setAlignment(). (#829)HEADtrunk

* Allow null values in XWPFParagraph.get/setAlignment().

A null value in this field would indicate that the paragraph should
follow the alignment provided by the style hierarchy.

Fixes: https://bz.apache.org/bugzilla/show_bug.cgi?id=69720

* Revert getAlignment() and implement isAlignmentSet() instead.

* Replace test case file.

* Implement XWPFParagraph.getTCPPr(create).

It lets the caller choose if a new PPr should be created in case it
doesn't exist.

* use getCTPPr(boolean)

* compile issue

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Co-authored-by: PJ Fanning <pjfanning@users.noreply.github.com>

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