Duplicate comments in database file

[merces]

To reproduce:

1. Open a file and add a comment (for i.e. first at offset 0).
2. Save and quit with :x.

The .dz6 file generated is as follows:

bookmarks = []

[[comment_name_list]]
offset = 0
comment = "first"

[comments]
0 = "first"

As shown above, currently both comment_name_list and comments store the same comment.