This 0.5.5 is a minor unstable release.
It contains improvements and bug fixes.

Features
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* add --paper option
* dump F: images with -f png
* improve --Version results
* support abc-paths.sh and abc-files.sh script for user defaults in -i
* support -f midi for playback using external timidity
* support abc-source embed und extract with PNG
* support ToC style index with title, key and some notes

Maintenance
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* detect and use librsvg
* adapt to Oyjl API changes
* add absolute abc filename with -f=abc -v in F:
* allow --select=-1 as deselect for -f HTML - helps with -R gui
* switch to oyjlBase64Encode() and internal remove code
* skip . file results, when in ~
* synchronise internal ABC file search with -i
* build and install internal abc2midi 5.02
* support --Version=abc2midi|timidity

Documentation
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* add link to timidity, updates and minor corrections

Fixes
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* fix --filter  and --select working together
* fix check sizes
* fix crash on list on input
* fix F: absolute image path detection