Allow configuration of accuracy of percentage totals printed

[nedbat]

Originally reported by Geoff Bache (Bitbucket: geoffbache, GitHub: Unknown)

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As all the modules in my code are over 97% coverage now, I find it helpful to have the report show percentages to 1 decimal place instead of to the nearest integer. I enclose a patch, including a "farm test (?)" which achieves this via the command line and "-D 1".

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• Bitbucket: https://bitbucket.org/ned/coveragepy/issue/16
• This issue had attachments: decimalplaces.patch, decimalplacesHTML.patch. See the original issue for details.

[nedbat]

Original comment by Geoff Bache (Bitbucket: geoffbache, GitHub: Unknown)

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Now also integrated this change with the HTML report, new patch attached.

[nedbat]

Implemented in <<changeset 6eb9186761d9 (bb)>>, though not with the attached patch, and not with a -D switch.