Reordered args in symlink!

Args were [matrix weight i j].
Now they are [matrix i j weight], like mset!.
This fixes a but in popco.nn.propn/new-linger-wt-mat, which was
passing args in the mset! order.
Added popco2/popco1 comparison file, delete bad file

The old example3popco2.xlsx was based on buggy code.  The new comparison
spreadsheet compares proposition activations for crime3's example3 in
popco2 and popco1.
Changed propn-wts-from-analogy-activns to pass dim

In update-propn-wts-from-analogy-activns, I was passing the linger
matrix to propn-wts-from-analogy-activns, but the latter only used it to
get the dimensions in order to create a fresh square matrix.  This was
misleading and unnecessary.  Now we figure out the dimension in the
first functon, and only pass that number into the second one.