Add %_live%, %_cover% etc. for work relationships.
Add NEWS
Switch variable names and add ~workrelationship

which mimics the work relationship statement on the MB web site e.g.
`{live} {medley:medley including a} {partial} {instrumental} {cover}
recording of`
Handle i18n differently ...

... so that work relationship text can be translated as a phrase and not
as individual words.
Fix metadatabox sort order

Sort by displayed value not internal value.
Merge pull request #297 from Sophist-UK/sophist_fix_metadata_display_sort_order

Fix metadatabox sort order
Remove ~workrelationship stuff.
Merge pull request #285 from Sophist-UK/sophist_add_work_relationship_variables

Add %_performance_live%, %_performance_cover% etc. for work relationships.
Improve naming character handling in windows

Rather than replacing all invalid characters with _ this does something
slightly more sophisticated i.e.

" -> '
* -> +
:space -> space - space
: -> -
< -> {
> -> }
? -> _
| -> !

e.g. a track "Is She Really Going Out With Him?" on album "Daily Mail: Solid Gold, Volume 1: Rocking All Over the World" will be named:

"Daily Mail - Solid Gold, Volume 1 - Rocking All Over the World/Is She Really Going Out With Him_"

rather than

"Daily Mail_ Solid Gold, Volume 1_ Rocking All Over the World/Is She Really Going Out With Him_"

There is probably scope for further tweaking of the dictionary.
Further improvement to remove trailing .
Change / to - not _
Use array (definite order) instead of dict
Revert less obvious translations
Add alternative translations for unicode filenames
Reuse preserved_tags.