Changes in version 2010-09-29                      

  - R/which.class.R: Changed is.cat and is.cont to be based on S4
    Methods. This could have been done with S3, however the whole
    package uses S4.

                     Changes in version 2010-08-24                      

  - R/zzz.R: simplified

                       Changes in version 2010-03                       

  - Change maintainer info

                        Changes in version 1.7.0                        

  - Add split_terms function
  - Add toggle.sign method
  - catcont functions removed. Use the catcont package instead.

                 Changes in version 1.6.8 (2017-09-21)                  

  - Fix issue with Rd files causing a rejection by CRAN
  - Update docs, README.md

                        Changes in version 1.6.4                        

  - Fixes doc problems with '<-' methods
  - Fixes #6

                        Changes in version 1.6.0                        

  - Improve documentation
  - Import stats
  - Fix tests

                 Changes in version 1.5.4 (2015-06-24)                  

  - Fix issue with CRAN blocking
  - Expand tests for get.vars, lhs.vars, rhs.vars, lhs, rhs

                        Changes in version 1.5.3                        

  - Fix issue #5, get.vars(NULL, NULL) throws an error ... Thanks to
    Paul Bailey for poinint out the problem.

                        Changes in version 1.4.0                        

  - Fix documentaion for roxygen-4.0.0+ (#1)
  - No other functional fixes

                        Changes in version 1.3.3                        

  - Fix to prevent breakage from new testthat
  - Documentation moved to Roxygen2 format

                 Changes in version 1.3.1 (2012-11-30)                  

  - Fixes documentation
  - Adds Namespace

                        Changes in version 1.3.0                        

Added: as.character.formula

                 Changes in version 1.2.2 (2011-08-08)                  

[Modified] Added methods lhs, rhs, op, op.type for '<-' assignment
class. Previosly it did not handle this and produced an error.

  - n.b. statements with '->' return '<-'

                 Changes in version 1.2.1 (2011-06-17)                  

[Modified]

  - Fixed problem with NAMESPACE file

                        Changes in version 1.1.0                        

COMPLETE REFACTOR!!!

  - Now dependent on oeprator.tools-1.1.0
  - R/is.one.sided.R: is.two.sided is fixed
  - R/lhs.R:
  - R/rhs.R:
  - R/op.R:
      - fun( expression ) now returns an expression
      - replacement handles multiple values for replacing on
        expressions.