Prevent filtered deletion from deleting entire journal #932 and add lots of deletion tests

features/data/configs/deletion_filters.yaml

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+default_hour: 9
+default_minute: 0
+editor: ""
+encrypt: false
+highlight: true
+journals:
+  default: features/journals/deletion_filters.journal
+linewrap: 80
+tagsymbols: "@"
+template: false
+timeformat: "%Y-%m-%d %H:%M"
+indent_character: "|"

features/data/journals/deletion_filters.journal

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+[2019-10-01 08:00] It's just another day in October.
+Not much to write about.
+
+[2020-01-01 08:00] Happy New Year! 
+So this is the New Year. @holidays
+
+[2020-03-01 08:00] It's just another day in March.
+A stick, a stone, it's the end of the road.
+
+[2020-05-01 09:00] Happy May Day!
+@holidays @springtime Several holidays fall on this date.
+
+[2020-05-02 12:10] Writing tests. *
+@springtime They will help prevent bugs.