batch ROI export CSV unicode

[will-moore]

Fixes #158.
This reverts commit d9119de.
Shouldn't be needed once we have sys.stdout.encoding UTF-8 on
the server.

Requires ome/omero-py#150

To test, export ROIs from an image with pixel size of microns and check that µm is written to CSV columns correctly.

[jburel]

script not available

[will-moore]

Don't know why scripts are not uploaded to the server. But I just uploaded this script manually (from this branch).

[jburel]

area (µm) This should be area (µm²)
iviewer works correctly

also the values could be rounded e.g. 66.95859863900198 => 66.959

[will-moore]

This PR is just rolling back the .encode() that we don't need now. Not intending to add new features.
Also, I don't know how easy it is to write superscript to a text file.
I'm not sure we should be rounding here as the output is not for display but for further analysis
(equivalent to exporting a lossy jpeg instead of tiff for analysis).

[jburel]

My point is that iviewer and the script generate both a CSV but one round the result one does not
that could be very confusing for user
I will create an issue for unit display

[jburel]

issues #168 and #169 created
Merging the PR