For the full log of gretl changes since January 2000, see
http://gretl.sourceforge.net/ChangeLog.html

2014-07-28 version 1.9.91
- Add Japanese translation (thanks to Shintaro Nakagawa)
- Add new functions: curl(), jsonget(), nlines(), kpsscrit(),
  genseries()
- Add new command "setopt" for pre-setting of command options
- Add command "flush" for use with time-consuming scripts and
  hansl functions
- "smpl" command: add a --permanent option to make a sample
  restriction permanent (not undoable); also add an option
  --no-all-missing to complement --no-missing
- "data" command: support globbing for names of series to fetch
  from gretl native databases
- "ar1" estimation: better error message(s) on failure; also
  tighten the convergence criterion but add a --loose option
  for backward compatibility
- "modtest" and "coint" commands: add --silent option for each
- Importing "CSV" etc: handle UTF-16 and UTF-32 by recoding, if
  recognized via Byte Order Mark
- ghk() function: add an optional trailing argument to receive
  the derivatives of the multivariate probabilities
- weekday() function: generalize to accept series arguments
- kdensity() function: accept a vector argument
- When creating a matrix from {list} or {dataset}, add the
  names of the variables as column names
- Difference of means test: use Satterthwaite approximation if
  the two variances are not assumed to be equal
- $dwpval: return NA rather than flagging an error if we get a
  negative Imhof integral (and adjust the doc)
- GUI dataset structure "wizard": allow annual data to start in
  the year 1
- Fix bug: GUI crash when estimation of rho fails for ar1 model
- Fixes for the XLS importer including recognition of the Excel
  NA() function
- Fix broken encoding of German translation
- Fix bug in OS X (quartz) package: GDK could lose track of its
  PNG loader, so graphs would not display
- Hush some gcc-4.9.0 warnings
- Deprecate use of the "set" variable halt_on_error (and remove
  its documentation)
- Build: update config.guess and config.sub from autotools git
- Windows build: update to gtk 2.24.24; update gnuplot version
  to 4.6.6
