Remove tags portlet.
Precompute tag clouds.
Revert "Stop caching extracted data for files."

This reverts commit 041b70d170fb558eeb01ebf21416f02ea0780647.
Cache extracted text in a persistent object to prevent loading unnecessarily during normal operation.  Use gzip compression to cache the text, and impose a 256kb size limit on cached text to limit impact on database size.
Revert "Show number of files cleaned."

This reverts commit 89816ed5f9f53ad756d9d1de55c49784df5d01aa.
Revert "Fix logging on removal."

This reverts commit 04cc516e63834c284611385db891eda845a83f76.
Revert "Add a script to extirpate '_extracted_data'."

This reverts commit 5ae783498ef15b15bc3d525f1b7c2e551b40d20e.
Updated change log for extracted text caching improvements.
Merge remote-tracking branch 'origin/better-extracted-text-caching-lp1340295'

Conflicts:
	CHANGES.txt
Merge remote-tracking branch 'origin/precompute-tag-clouds-lp1302128'

Conflicts:
	CHANGES.txt
Making 3.131.