Changes to package DoE.base

This package is under development. Although substantial progress has been made, 
many parts are still considered experimental. Suggestions and bug reports are very welcome. 

Most important next steps include 
- extension of available orthogonal arrays for function oa.design
- data aggregation functions for designs with repeat.only replications and for 
  parameter designs (=innner/outer array designs)
- automatic creation of formulae for default analyses (will presumably take longest)

31/07/2009 Version 0.5
- changed R version to R-2.8.0 or newer (extractor for class design does not work 
  with earlier versions)
- added function print.design for printing useful information along with the design
- added function summary.design for providing key information from design.info in 
  convenient format
  (will be developed further and may still change)
- added functions reptowide and reptolong to reshape the experiment for 
  repeated measurements (repeat.only=TRUE) between wide and long shape;
  still experimental when applied to non-standard designs
- added function cross.design for crossing designs, 
  algorithm modified from function direct.sum from package conf.design
- added function param.design for creating Taguchi style inner/outer array designs, 
  and function paramtowide for setting these to wide format
- added type all to export.design so that both csv and html can be output at the same time; 
  meant for non-Excel users who want to work with csv file but nevertheless need the legend from 
  html file
- new function add.response to combine exported design with externally input response data;
  this is still somewhat experimental
- extended extractor method for designs to allow limited replication possibilities
- added modification step to creator attribute of designs modified by extraction
- removed intercept column from desnum attribute for designs created with 
  fac.design or oa.design or modified with factor.names
- bug fix: there were unintended names attached to the selected.columns element in design.info;
  these were not always correct and have now been removed
- bug fix: [.design did not always work correctly if j was not specified
- bug fix: run.no.in.std.order for run.order attribute of functions fac.design 
  and oa.design was previously made unique (by uniqueness of row.names for data frames); 
  corrected to yield the run numbers only
- bug fix: renamed randomized to randomize in functions oa.design and fac.design, 
  in line with package FrF2, and adjusted documentation accordingly

15/07/2009   Version 0.4-1
- bug fix in function fix.design: error checking for changed factors 
  had a bug and stopped perfectly legal edits from being stored.


13/07/2009   Version 0.4
- all experimental factors are now R-factors, even if they are numeric
- export.design can now also export the R workspace only, without csv or html
- bugfix: export.design did not correctly check replacing of files in case of 
  capital letters in file names
- modified export.design to handle factor labels with blanks from (future) GUI 
  package RcmdrPlugin.DoE
- added S3 generic for fix with default and design method
- extended design.info for output objects from function oa.design to include nruns, 
  nfactors and nlevels
- improved documentation of class design and the respective parts of the value 
  sections of functions oa.design and fac.design
- included function contr.FrF2 and constant Yates from package FrF2 
  (not exported; also remain in package FrF2)

27/06/2009   Version 0.3
- added list element creator to design.info attributes of created designs
  and improved documentation of class design and its accessors
- bug fix in documentation to export.design and several other small changes 
  in documentation and package description
- substantially improved and extended documentation to function oa.design

26/05/2009   Version 0.2
- modified internal function html.data.frame, 
  so that top row of html file created by export.design 
  is only one row when file is opened in Excel 
  (changed top row formatting from <h3> to <b>)
- added options filename and replace to function export, 
  in order to protect users from inadvertent replacement of existing 
  files and to allow filenames different from design names
- moved documentation of constant Letters from oa.design.Rd 
  to Utilities.Rd