Thu Aug  4  2011  T Horinouchi
	* version 1.7 released ((cvs) tag: numru-units-1_7)
	* LICENSE.txt: added (BSD 2-clause)
	* doc/units.rd, doc/units.html: updated (added entry to dcunits.txt)
Wed Aug  3  2011  T Horinouchi
	* mulnode.rb: to_s changed to explicitly handle a Float
	  whose value is an integer.
	* Makefile: adopet to the change in the "tail" command
	  (tail +2 --> tail -n +2).
Mon Mar 15  2010  T Horinouchi
	* version 1.6 released ((cvs) tag: numru-units-1_6)
Fri May 23  2008  T Horinouchi
	* dcunits.txt: added the following units: percent [S], % [S],
	   permil [S], centigrade [P], millibar [P]
	* rules.rb: changed not to accept empty unit_spec
	* lex.rb: 
	  * method do_parse2: to treat empty string units '' as '1'
	    (to return NumberNode.new(1) instead of ErrorNode.new(''))
Fri Feb  8  2008  T Koshiro
	* lex.rb: next_token: at least one space or tab character is required
	  before/after 'per', 'after', 'from', 'since', 'ref'
Wed Aug 24  2005  T Horinouchi
	* version 1.5 released ((cvs) tag: numru-units-1_5)
Wed Jun  8  2005  T Horinouchi
	* lex.rb:
	  * debug in RE_SECOND
	  * debug in time zone parser (many bugs)
	  * improvement in time parser RE_TIME to support hhmm type
	    in addition to [h]h:[m]m
	* timenode.rb: 
	  * TimeNode#utcsod : debug in time zone treatment 
	    (IT WAS A FATAL BUG!!)
	  * TimeNode#to_s : debug in the expression of seconds (not to 
	    take the floor of seconds).
Wed May 25  2005  T Horinouchi
	* version 1.4 released ((cvs) tag: numru-units-1_4)
	* lex.rb: debug in RE_HOUR. It did not handle hours after 20 properly.
Mon Nov 29  2004  T Horinouchi
	* timenode.rb: class XDate: added to_date (for intenal usage), and
	  modified +(ohter) and -(ohter) methods to use it as long as possible.
	  This is to widen the coverage of time -- up to now, only very
	  recent years (such as AD19xx-20xx) are accpeted, since the
	  Time intrincic class is always used.
Tue Nov  9  2004  T Horinouchi
	* lex.rb: Units#convert2: changed warning messaging to show backtrace
Sun Aug 10  2004  T Horinouchi
	* lex.rb: lex.rb Units#convert, Units#==: debug not to change
	  (reduce5) self and input units.
Sun Aug  8  2004  T Horinouchi
	* version 1.3 released
	* mulnode.rb: improved Multi#sort: to eliminate Number[1] if
	  length >= 2. Then, Units.new('1m').reduce5.to_s gives 'm';
	  it used to give '1 m'.
	* numbernode.rb: defined == (to compare by values -- implicitly
	  used in the new Multi#sort)
	* dcunits.txt: added some units from udunits: Pascal, deg[KF],
	  deg_[CFK], degree[CFK], [Cc]elcius, angular_(degree|minute|secont),
	  [Ff]ahrenheit, farad, gravity, conventional_mercury, mercury,
	  Hg, hg, Julian_year, common_year, tesla
	* lex.rb: debug === (aliased to ==. The change on May 4 was enbug).
                  debug =~: to handle other classes (return false)
Tue May  4  2004  T Horinouchi
	* pownode.rb: PowNode#to_s: if the expopnent is 1, omit it.
	* lex.rb: debug === (to allow a difference of a factor and/or offset)
Sun May  2  2004  T Horinouchi
	* dcunits.txt: added degree_east/degrees_east etc.
Sun Mar 21  2004  T Horinouchi
	* version 1.2 released ((cvs) tag: numru-units-1_2)
Fri Mar 19  2004  T Horinouchi
	* mulnode.rb: MutiNode#value: to return 1 if @children.size == 0
	* dcunits.txt: added degC
	* lex.rb: convert2: warn if $VERBOSE --> warn regardress $VERBOSE
Mon Mar  1  2004  T Horinouchi
	* version 1.1 released ((cvs) tag: numru-units-1_1)
Mon Mar  1  2004  E Toyoda
	* test.rb: revised due to the change of reduce4; updated
	* timenode.rb debugged (Unexpected generation of Float by Date#-
	  is avoided using Date-like wrapper to Time.)
	* node.rb: unalias (such as "kilometer" -> "10^3 m") will not
	  occur at reduce4. (plurals still recognized in reduce4)
	* namenode.rb,numbernode.rb: unused methods "nameable?" removed
	* makeutab.rb: Bugfix: units like "second" or "metre" were not
	  unaliased to its primary name (such as "s" or "m") due to
	  improper parsing of dcunits.txt.
Sun Feb 29  2004  E Toyoda (Commited by T Horinouchi)
	* makeutab.rb: debug plural treatment (/y$/ -> /[^aeou]y$/)
Fri Feb 27  2004  T Horinouchi
	* src/lex.rb: added Units#convert2 (similar to Units#convert but
	  more suitable for UNumeric constraction).
	  debug in =~
	* test.rb: added a test of =~
Thu Feb 26  2004  T Horinouchi
	* src/lex.rb: added Units#factor_and_offset
	* doc/units.rd: updated
Wed Feb 25  2004  T Horinouchi
	* src/Makefile: add -l option to racc -- not to convert line #s
	  for better readability of exception messages
	* Makefile: (very minor) cp --> cp -p
Tue Feb 24  2004  T Horinouchi
	* version 1.0 released
	* packaging for distribution
	* put Units into the NumRu module ( --> class NumRu::Units )
	* cvs version control started (CVSROOT=
	  dennou-k.gfd-dennou.org:/GFD_Dennou_Club/ftp/arch/ruby/cvsroot
	  project name: numru-units)
Fri Feb  6  2004  TOYODA Eizi (log written by T Horinouchi 2004/03/24)
	* revised
Fri Nov  7  2003  TOYODA Eizi (log written by T Horinouchi 2004/03/24)
	* revized
Fri Oct 24  2003(or before) TOYODA Eizi(log written by T Horinouchi 2004/03/24)
	* created
