/commits.php is going away

• 460430 Mk/Uses/mono.mk
• 460430 audio/taglib-sharp/Makefile
• 460430 deskutils/tomboy/Makefile
• 460430 devel/dbus-sharp/Makefile
• 460430 devel/dbus-sharp/pkg-plist
• 460430 devel/flickrnet/Makefile
• 460430 devel/google-gdata/Makefile
• 460430 devel/google-gdata/distinfo
• 460430 devel/google-gdata/files/patch-Makefile
• 460430 devel/google-gdata/files/patch-src_gapps_auditservice.cs

lang/mono: update to version 5.2.0.215 (and enhance USES=mono)

Highlights:
 - New Roslyn compiler for C# available
 - Improved support for nuget packages in USES=mono

General:
 - fix pkg-plist: mono now produces '.pdb' debug files instead of '.mdb'
 - bump all dependant ports

USES=mono:
 - properly handle caching of nuget packages
 - add support for multiple feeds for nuget packages
 - add support for nuget dependencies in a separate file
 - add support for paket packages

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