Scour should only change precision if -p is given

Created by: launchpad-issue-importer

Currenly, Scour by default drops precision to five digits, so a file using 7 digits of precision (not all uncommon for Adobe Illustrator files, especially dumb ones, where the whole image is in a view box somewhere 7200 units away from the coordinate system origin) will silently be degraded, without warning.

At least I would not expect lossy behaviour by default; it's non-unix:y.

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Imported from Launchpad using lp2gh.

• date created: 2011-06-07T00:37:35Z
• owner: ecmanaut
• the launchpad url was https://bugs.launchpad.net/bugs/793811