[Gretl-announce] gretl 2021d released

See http://gretl.sourceforge.net/ This is mostly a bug-fix release, but there are two new features to report: * An enhancement of the "biprobit" command, whereby rho, the correlation between the errors in the two equations, is available as part of the parameter vector, $coeff, and the covariance matrix, $vcv. * Support for linear programming, courtesy of the lpsolve library. On Linux you need to install the lpsolve package to activate this feature (but that's easy via your distro's package manager); in our Windows and macOS packages we supply a suitable build of the library. PDF documentation can be found under the gretl Help menu ("Linear programming"). Here's the change log entry: 2021-09-30 version 2021d - "biprobit" command: include rho in $coeff, $stderr and $vcv - New function lpsolve(): supports linear programming via the lpsolve library - Prevent opening of general and console preferences dialogs simultaneously - Fix partial breakage of the panel-time plotting facility - Fix potential failure mode in echoing script input lines in the GUI program - Fix a small and somewhat unlikely memory leak - Fix a GUI build error when using GTK 2 - Fix Windows bug: greek-letter identifiers not working in some locales - Fix Mac bug: binary data read/write not accessible - Fix Linux bug: possible crash when running MPI from the GUI program -- Allin Cottrell Department of Economics Wake Forest University