Assorted fixes to combineCols and combineRows.

[LTLA]

Partially motivated by libscran/scrapper#35.

[DarioS]

Also, even with SVT_SparseMatrix, I can't combine published G.E.O. data sets.

length(humanList)
    19
table(sapply(sapply(humanList, counts), class))
     SVT_SparseMatrix 
                   19
table(sapply(sapply(humanList, logcounts), class)) # Created by analyze.se
    DelayedMatrix 
               19
database <- Reduce(function(x, y) {combineCols(x, y, delayed = FALSE, fill = 0)}, unname(humanList))
            Error: C stack usage 7969312 is too close to the limit

I am aiming to do library(tiledbsoma) and write_soma(database) afterwards.

[LTLA]

Seems like a separate issue, let's stay on topic here.