                 Changes made between Versions !PolyNet

   Date   Version Changes from previous version
 22 Jun 97  1.04  All errors, interactive help etc use Messages file

 25 Jul 97  1.05  - Improved read routine with more checks on data consistency
                     does not attempt to read incomplete nets from a data file
                  - Write new data file only saves complete nets, partial ones
                     cannot be written to a data file, only to a Draw file
                  - Write out 3D vertices from input file (not rotated ones)
                      when writing a new data file with the net
                  - Put 'restart' in 3D menu to forget any net so far created
                     (same effect as dropping the data file on iconbar again)
                  - when writing out a new data file from an old one which 
                      contained one of its own comments, it merely updates the
                      comment, it does not add another one.
                  - Comment lines of up to 80 characters are copied 
                     (previously anything over 60 was lost)
 18 Aug 97  1.06  - Allow reading of files of filetype PolyData (152) in 
                      addition to text files for input data
                  - data files written now have filetype PolyData
                  - tabs are now drawn behind the faces
                  - the net is now rescaled to the input solid size on 
                      writing out data
                  - on input the net is rescaled to the size of the solid
  3 Dec 97  1.07  - minor bug fixes
 18 Dec 97  1.08  - enhanced sorting of faces for complex solids
                  - bug fix to drawing tabs near the boundaries of a Draw File
 23 Mar 98  1.09  - make tabs on incomplete nets
                  - allow space for all solids from !Stellate
                  - speed up drawing coloured faces on complicated solids
                  - removed several bugs in the drawing of tabs
 05 May 98  1.10  - allow overwriting the polydata file
                  - allow more complicated faces from !Stellate 1.05
 24 Feb 99  1.11  - allows colouring of faces in saved Draw file
                  - interactive help for menus
                  - better face sorting for complicated polyhedra
                  - direct printing through a printer driver
                  - minor bug fixes
 08 Mar 99  1.12  - bug fix for plotting non-convex polygonal faces
                  - transmission of Wythoff symbols for uniform polyhedra
 26 Apr 99  1.13  - allow saving more than once to sloppy applications
 17 Nov 99  1.14  - allow >10 character file names for RISC-OS 4
                  - checks for !Stellate's split faces but can not use them
 26 Nov 00  1.15  - increased dimensions to allow for uniform polyhedra
                  - more stringent checks on overlapping faces
                  - dashed lines on tabs at convex edges.
 04 Feb 01  1.16  - Fix to face sorting to correct W54.
 01 Mar 01  1.17  - Demo version is now a disabled full version.
 22 May 02  1.18  - Demo version now works on VirtualAcorn
                  - symmetry data transmitted.
