For the full log of gretl changes since January 2000, see
<@url="http://gretl.sourceforge.net/ChangeLog.html">.

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
