mtCellEdit Update

Progress on my mtCellEdit spreadsheet program has been slow over the last year due to time constraints (which is why I haven't published any code in over a year), but here is the latest screenshot of the development version:

It can now edit multiple sheets in a single file (using a ZIP file as a container), I can use coloured backgrounds and foregrounds, copy/paste now uses the system clipboard, and columns can have whatever width you want.  The back end C library is about 50K of object code, and the GUI is about 56K so once the program is completed it should be as light as a simple text editor.  This will be great for my old PC hardware as Gnumeric/OpenOffice are way too slow to use comfortably.