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Add unit tests for SUBSTRINGP

Fix an example in the documentation for MEMBER.

Add tests for MEMBER

Add more tests for MEMBERP based on a recent code review.

Improve a comment

Add more information to documentation for PAUSE, including how to exit pause mode.
This is part of Feature Request #136.

Fix a comment

Fix a comment

Remove trailing whitespace from the text of LOCALIZED_UNSAVEDCHANGES_MESSAGE1.
This looked like an accident, not something that was intended to be rendered in the dialog box.

Strip trailing whitespace from localizedstrings-*.txt to stop it from re-appearing in localizedstrings-*.h after running mklocale.pl.