protect for asdf symbols not being there.

Port to clasp

Modernize the .asd files and hush one test on SBCL

thanks to https://github.com/orivej for noticing.

Thanks to Scott Burson.

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darcs-hash:20080621010834-3cc5d-f08b6488f60f713709b033e8b8dbf0c7808f7bd7.gz

export file-new-than-file-p; stop exporting a whole bunch of things that aren't in metatilities-base

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