Clean up vestigial parts of data structures

Error check puzzle number, streamline usage/err calls

Web site's response changed so adapt script to handle it

Make it behave if given trc=NA (like kenken-logic.R args)

Add link to puzzle creation tools

Implement rule applying to groups in a single row or column

Tweak code, fix a comment

Label rule counts for user understanding

Heuristic: 3- and 4-sized groups solving

Gather counts of rule applications; use to order rules for efficient …

Add another solving link to the README

Rework termination logic

Add cross-row elimination rule to logic solver

Implement odo option to control odometer like brute-force does

Use the simpler, more general "Union rule," removing "Naked group" rule

Add pointer to Caleb Sander's solving rules

Reorganize the text a bit

Shorten text to fit in scroll window

Fix typos, clarify text

Remove silly copyright notice - it doesn't really apply to the puzzle…

Rewrite div operation function to use table lookup for speed

Reorganize README text slightly to keep the section focus

Add in remote usage instructions to README

Update copyright notice

Add another solving pointer

Don't try adjusting text next to grids to reduce error messages

Use trial-grids in README examples; expand summary.

Fix up description of kload.sh

Tidy up code, handle format failures more gracefully

Add difficulty to downloaded grid info