Issue tracking: add things and start 004.

doc/issues/in-progress/002-add-support-for-text-entries.md

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+### Add support for text entries.
+
+Thinking is to allow recording an arbitrary text value alonside a timestamp.
+Presentation would be something like a list of the values. Probably no graph
+(maybe something like a histogram for some use cases?).

doc/issues/in-progress/004-add-the-ability-to-delete-measures.md

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+### Add the ability to delete measures.