v5.5.0

In this release, we introduce new packages for solving nonlinear least-squares when the variables are constrained to lie between lower and upper bounds, or are constrained to lie within the intersection of non-overlapping unit simplices. In addition, we provide packages - using either projection or interior-point iteration- for solving the linear least-squares sub-problems that the nonlinear algorithms depend upon. We also provide a number of fixes for issues that arose with other GALAHAD packages. All packages are written in Fortran, but with interfaces to C, Python, Julia and Matlab.