Export fails if non-ASCII in protocol name

[Ed McDonagh]

Affects fluoro, probably others.

Thanks to Linn Rolstadaas for the report.

[Ed McDonagh]

Simple fix is to add a 'u' to the start of the string on line 616 of rf_export.py to make it unicode.

[Ed McDonagh]

Converting the progress update that incorporates the protocol name to unicode. Fixes #449

→ <<cset ac0e2bc40988>>

[Ed McDonagh]

Changes for ref #449

→ <<cset 0b503e1d7074>>

[Ed McDonagh]

Merging issue430-442errorcatching back into develop. Fixes #442, refs #430,#449,#454,#458

→ <<cset 4089c23ddffc>>