This 0.5.2 is a minor unstable release.
It contains small improvements and bug fixes.

Features
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* output to tune title with equal sign -o =
* read ABC from SVG and write ABC code into PDF
* support --abc-remove option
* handle grid2 0 for excemption of tunes from text songs
* add --Version option to display library versions

Maintenance
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* add check ABC -> SVG -> ABC roundtrip including '<' for SVG
* add new tests for roundtrip and -o== output file name from title renaming
* replace memmem() for portability
* improve the test and use all tunes from extras/test.abc for renderng svg, pdf and png
* CI: install librsvg2-bin and pdftk
* Add more tests for ABC, SVG, PDF and PNG. Include accordion.abc from abcm2ps.
* test.abc: reorganise grid2 to switch grid2 song layout
* CI: add deploy stage for GitLabPages
* CI: embedd SVG font-face as base64
* link with librsvg

Documentation
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* create extras/compare.md test page
* GitLabPages: show compare.html with the renderd libMusicAbc sample ABC files
* add index.html for GitLab Pages
* GitLabPages: add PDF output
* add Fonts.md

Fixes
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* fix abc_end detection in HTML and SVG
* improve ABC tune splitting
* adapt to formal app specific directive
* fix %%grid2 3 capo font size