Upgrade to Movable Type 4.21

Probably a big mistake. I can't see any published pages anymore. If you are reading this, though, then I've solved the problem.

I ended up installing a lot of Perl packages to get things working:

• version
• Text::Balance
• IO::Compress::Zlib
• IO::Compress::Base
• Compress::Raw::Zlib

The compression ones were in the forlorn hope that I would be able to get backups with compression working. No joy.

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Wow. Now publishing my website (say, after a style change) takes hours.