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

2016-01-26 version 2016a
- syntax enhancement: allow specification of type when setting
  a bundle member
- syntax enhancement: allow specification of a null default
  value for a matrix argument to a user-defined function
- script execution: save "compiled" loops in functions that
  are called repeatedly, for greater efficiency
- add exists() function, recommended as a replacement for the
  now-deprecated isnull()
- add pxnobs() function: gives the number of valid cross-
  sectional observations on a given series in each period
- pxsum() function: revise this to skip missing values
- the gretl array type: document the array() and defarray()
  functions
- "arima" command: allow ARIMA(0,1,0) without constant
- "heckit" command: allow clustered standard errors
- "reset" command: add --silent option
- "store" command and GUI "Export data" menu item: add option
  to save data in Stata's binary format (dta version 113)
- "funcerr" keyword: allow use of a string variable to provide
  the message to be printed
- Improve handling of string-valued series across sub-sampling
- Improve display of string-valued series in GUI
- seasonals() function: enable this for panel data when a
  suitable imterpretation of the time dimension has been set
  via "setobs"
- Fix bug 196, Help button for HCCME misaligned in case of a
  non-MPI enabled build
- Fix bug 197, invalid "xtics" specification for some weekly
  time-series plots caused gnuplot to abort
- Fix bug: failing to detect common "missing value" strings in
  spreadsheet data importation via the GUI
- Fix for linearize() function: don't fail when tramo finds
  that the input doesn't need linearizing
- Fix bug: incorrectly sized object in ODBC data importation
  could cause a crash
- Fix bug: possible crash on importing data from a Stata dta
  file on 32-bit Windows
- Fix bug: in "hsk" the auxiliary regression should always
  include a constant, even if the base specification doesn't
- Fix bug: South-East element of intreg Hessian was buggy
  (was affecting Tobit as well)
- Fix bug: in GUI setting of dataset structure, the interpret-
  ation of stacked cross-section panel data was incorrect
- Application of "catch" to user-defined functions: drop back
  from an error to a warning, for now
- Appending daily data: don't fail when we have enough date
  information to succeed
- Improve handling of EPS plot output (including respecting
  the color/mono choice properly)
- Stata dta importer: support dta format 118 (Stata 14)
- GUI: some cosmetic fixes specific to gtk 3
- GUI script editor: implement choice of gtksourceview style
- GUI function package editor: ensure that old-style "minimum
  version" specification is read correctly; also ensure that
  appropriate line-breaks are set by the help-text editor 
- MS Windows package: update to OpenBLAS 0.2.16.dev to avoid
  bug in computing eigenvalues on 64-bit Windows
- Add workaround to avoid OpenBLAS crash on matrix inversion
  when the input matrix contains NaNs
- Remove support for gnuplot < version 4.6.0
