Upstream changes:
Version 2.01 - 24 October 2012 (bug fix release)
* Fixed error in electronmass
* New definition for au
* Fixed DESTDIR support for installation
* Changed configure script for success with Solaris
* Small changes to manual
User visible changes.
Version 2.00 - 6 June 2012
General changes:
* Unit lists provide conversion to sums of units (e.g. feet and inches).
* Added --round (-r) and --show-factor (-S) options for use with unit lists.
* Added unit lists aliases (e.g. time, usvol).
* A python script, units_cur, can update currency data.
* Units now flushes its output so you can talk to it with a pipe.
* Units now works in UTF-8 if the system supports it.
* Added --locale (-l) option to set the locale.
* English units such as the gallon are defined in all locales, with US
definitions by default except in the en_BG locale. You can force
the desired definition (Great Britain or US) by setting the
environment variable UNITS_ENGLISH to GB or US.
* Revised and extended the documentation, with more examples.
* Added locale mapping to address Windows locale names.
* Updated and revised units database, including UTF-8 definitions and
the 2010 CODATA.
* Fixed parsing bug for "1..2" or "1.2.3". These now give an error.
* Unit names can end with a number in the form of a subscript that
starts with a '_', as in 'X_3'.
Changes for units definition files:
* Changed location and names of unit database, splitting off currency
Files are /usr/local/share/units/{definitions,currency}.units and
the personal units file is $HOME/.units instead of $HOME/units.dat.
(Under windows personal unit file is unitdef.units.)
* Personal units filename can be changed with MYUNITSFILE environment variable.
* Prefixes can be defined in any order: it is no longer necessary to
define longer ones before shorter ones.
* New definitions replace previous ones. Personal units file is read
after the system file rather than before.
* Changed syntax for function definitions. Instead of [in-unit,out-unit]
you must now write units=[in-unit,out-unit]. Use 'units -c' to find
places in your personal data files that need to be updated.
* Add optional domain and range to function definitions with syntax
domain=[min,max] and range=[min,max]. Either min or max can be
omitted to signal infinity.
* Unit list aliases can be defined with !unitlist command.
* Added !var and !varnot and !endvar to include definitions based on
environment variable settings.
* Added !set to set environment variables (if they aren't already set).
* Added !message to display a message
* Data files are in UTF-8, with !utf8 and !endutf8 commands to mark
definitions that require UTF-8 support.
* Improved error handling when reading units.dat.
Version 1.88 - 15 Feb 2010
* Updated units.dat
* Fixed bug involving readline version 4.2
Version 1.87 - 25 Sep 2007
* Units reads ~/.units.dat if it exists before reading the standard
units database.
* Added support for ** as an exponent operator.
* Type 'search text' to list units that contain 'text' in their name.
* Precedence of '*' changed to match precedence of '/'.
(Multiplication by juxtaposition retains a higher precedence than
'/'.) The --oldstar option selects the old precedence and --newstar
forces the new precedence.
Based on PR 30397 by Cameron Patrick, I modify to adapt to recent pkgsrc
tree and update from 1.85 to 1.86.
GNU Units can convert quantities expressed in one unit to an equivalent in a
difference scale. Compared to traditional BSD implementations, it offers more
units, non-linear conversions (e.g. between degrees Celsius and Fahrenheit), a
more lenient input parser, and tab completion. It can also be used to perform
calculations taking physical units into account, and provide the definitions of
units (e.g. "joule = N m = 1 kg m^2 / s^2").
