Fix bug in hasCoef/hasBasis: was returning TRUE even if the matrices had no columns/rows.
Fix issues in nmfModel,formula: match term length with nrow first, and handle data.frames
Add utility function str_dim, whihc output formated dimension
Fix issue in nmf,matrix: match number of rows in input matrix against target rows before columns
Run complete example in nmfRankEstimate except when checking
Improve survey plot from rank estimation: better wrapping, free scales, etc..
Fix bug for fixed term NMFstd models: transpose was not swapping fixed terms
Add unit test for nmfModel,formula
Update vignettes + bump version to 0.17.6