PBSddesolve Changes
===================
v.1.05  2008-09-19  Rowan
 - Changed package name to 'PBSddesolve' from 'PBSdde' (thanks Andy).
 - Added vignette 'PBSddesolveIntro.Rmw'.
 - Changed 'lorenz' demo pairs to use pch=15, cex=0.2 (works on Windows and Ubuntu UNIX).
v.1.04  2008-08-01  Rowan
 - Changed package name to 'PBSdde' from 'ddesolve'.
 - Changed 'lorenz' demo pairs to use pch="." (before: pch=183 does not work on UNIX).
v.1.03  2008-06-08  Alex
 - Fixed examples to correctly set names.
v.1.02  2008-04-15  Alex
 - Allow gradient to return a list of length one.
 - Set state variable names so they are available for use in the gradient function.
 - Moved documents to correct vignette locations.
v.1.01  2007-10-01  Alex
 - Removed c++ style comments to remove warnings for 2.6.0 release.
v.1.00  2007-07-17  Rowan
 - Revised Users Guide (also added reference to FishRes in PBSmodelling).
 - Revised examples to deal with slight flaw in PBSmodelling's resetGraph().
 - Created *_doc.pdf files for the examples to replace the *_doc.txt files
     (also altered the win files to get the PDFs).
v.0.63  2007-07-16  Rowan
 - Revised examples, Rd file
 - Revised icecream example to show use of the argument "parms".
v.0.62  2007-07-13  Rowan
 - Revised examples (blowflies, cooling, icecream).
 - Jon revised Users Guide.
v.0.61  2007-07-12  Alex
 - Added ability to have parms argument for maps and switches if parms is given to dde.
v.0.60  2007-06-27  Rowan
 - Revised Rd file.
 - Revised UG.
v.0.59  2007-06-10  Rowan
 - Revised ice cream example and created GUI for it.
v.0.58  2007-06-10  Alex
 - Changed switch numbering to 1..N range.
v.0.57  2007-06-04  Alex
 - Added call to grad() from output() to ensure that extra info is accurate
     when interpolating to solve for explicit times.
v.0.56  2007-05-30  Alex
 - Removed by argument from R and C code.
v.0.55  2007-05-30  Rowan
 - Merged ACB's 0.54 dde() wrapper with BJC's desolve() wrapper 
     (only times specified; no 'from,to,by').
v.0.54  2007-05-29  Alex
 - Fixed bug in dde() where outtimes wasnt passed correctly.
v.0.53  2007-05-24  Alex
 - Merged in Ben's code.
v.0.52  2007-05-18  Alex
 - Added switch functionality - still needs documentation.
v.0.51  2007-05-06  Alex
 - Renamed initstate to ddeinitstate in C code.
v.0.50  2007-05-05  Alex
 - Released to Cran as version 0.50.
v.0.07  2007-03-12  Alex
 - Added check for restoring working directories in demos.
v.0.06  2007-03-11  Alex
 - Removed .rc files.
v.0.05  2007-03-03  Alex
 - Changed demos.
v.0.04  2007-02-23  Alex
 - Added error checking to prevent calls to pastvalue(t).
 - Switched order of `t` and `y` expected from user supplied `func`. Now is func(t,y,parms).
 - Created user guide "ddesolve-ug.pdf".
v.0.03  2007-02-23  Alex
 - Fixed bug where pastvalue() could not be called during `func` test
     it just returns initial values during the `func` test phase.
v.0.02  2007-02-22  Alex
 - Added pastgradient R wrapper function.
 - Added demos.
v.0.01  2007-02-18  Alex
 - Created package around Simon Wood's numerical routinues from solv95.