Improve error message when marshalling fails

[danbroooks]

Alters the error message that appears when marshalling DB values to include the name of the table. I have found it useful to know the table when this error rears its head with generic field names (lastAccessed for example), allowing me to go straight to the offending table.

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I'm not sure which of these I need to complete for this change (bumping version number seems drastic, and I've not changed any public facing API):

Before submitting your PR, check that you've:

• Bumped the version number
• Documented new APIs with Haddock markup
• Added @since declarations to the Haddock

After submitting your PR:

• Update the Changelog.md file with a link to your PR
• Check that CI passes (or if it fails, for reasons unrelated to your change, like CI timeouts)

[psibi]

@danbroooks Thanks for the PR! I like this. :-) I think some part of the code change in the PR are just formatting. Can we avoid that or keep that in a separate commit ( I would like to avoid it if the code isn't changed for easier review and easier git-blame for future references) ?

Also, can you give a sample example of the previous and the current error message with this PR ?

[danbroooks]

@psibi I have modified the commits so the re-arranging of stuff is separated from the changing of the error message. The change to the message simply adds the relevant table name to the error message as can be seen here:

8b1fa1d#diff-26b0e2f04e1da957f51921997c4ca77dR1016

[psibi]

@danbroooks Thanks!

[psibi]

Also, a new version has been released to Hackage with the changes. Thanks!