Renoise updated to v2.6.1

Renoise has been updated to version 2.6.1.

Changes/fixes are:

• Autoseek with multiple note columns didn't always work.
• Renoise saved some 24-bit FLAC files wrong on Linux x64_64 - applies to 64-bit versions only.
• Demo versions nag screen nagged demo version users way to early.
• Mac OS X demo versions did not include the scripting API documentation and MIDI/OSC scripts.
• A few other Lua API related fixes.