scripting: investigate behaviour of title setting with degree symbol

[FreddieAkeroyd]

Issue Description

On POLARIS a title was set containing a degree symbol

g.change_title("Pos3: M 400°C-treated calcium iridium niobium oxide pyrochlore in 6 mm V foil can, RT")

But the .xml file shows this as "<title NAPItype="NX_CHAR[16]">Pos3: M 400÷</title>" or

The title also looks odd in the NeXus file too. This needs tracing through the logic to see where UTF-8 is not being preserved (Polaris journal_25_5.xml file, polaris00162323.nxs)

Acceptance Criteria

A title can be set using any valid UTF8 character

note

There have been issues in the past with non-ascii characters, I though it had been working but would need to look further. Past issues have revolved around different windows code pages e.g. labview used https://en.wikipedia.org/wiki/Windows-1252 i think not utf-8