News in 3.17.2
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* New widget: GtkSourceMap
* Set a GtkTextTag name for context classes (no-spell-check, etc)
* Add gtk_source_buffer_sort_lines()
* Style schemes:
	* Support "single", "double" etc for the underline attribute
	* Support underline-color
* Improvements to lang files: Ocaml, C++ header and Shell
* Translation updates