[Gretl-announce] gretl 2020b released

See http://gretl.sourceforge.net/ 2020-04-11 version 2020b - Update gretl copyright notice - Revise macOS build: don't require initialization via shell script, and link against version 10.9 of the SDK - "gnuplot" and "plot" commands: add a --ylogscale option - "store" command: add --matrix option to save a matrix in the form of a dataset - strvals(): support retrieval of subset of string values for current sample range - ODBC importation: correct the handling of string-valued series; add --verbose and --no-align options; ensure appropriate error messages in GUI usage - "dataset addobs": add a --panel-time option - "slicing" of arrays: allow use of selection vector - Functions called via "if": show any printed output - "dataset addobs": add --panel-time option to extend a panel dataset in the time dimension - stack() function (see Guide chap. 4): replace option flags with optional arguments - monthlen(): allow for series arguments - Revise handling of string-valued data in exportation to Stata .dta format - Hide the recently added funcerr() function and replace it with the new function errorif() - Streamline building of "online" help files - Fix for normalization of paths on MS Windows - Several minor bug-fixes -- Allin Cottrell Department of Economics Wake Forest University