v4.7 [Aug 16, 2014]
V4.7 2014-08-11
Changed the order that two kinds of colouring are evaluated. Simple "double-exclusion" is now checked for before "full-chain contradiction", as this is simpler to spot. This probably won't make much difference to most colouring cases.
v3.9 [Sep 21, 2011]
-Added two more colour options, bringing the total to six.
-Fixed a bug that could result in some grades being displayed incorrectly when printing puzzles from the library.
-Added the option to show or hide pencil marks. This purely controls whether they're displayed, and not whether they're updated or not.
-Added the ability to create a bookmark to save the current state of the board. You can create a bookmark, try a particular solving route, and if it doesn't work out, restore to the point when the bookmark was taken.
-When single stepping, the explanation of each step is shown in the status bar.
-Fixed a bug that could result in the same puzzles being printed on successive runs of the program. This fault was introduced in version 3.7, and only happened if background puzzle generation was disabled.
-Improved the behaviour when pasting from Excel so that consecutive tab separators correctly result in an empty cell.
-Corrected a problem when the "not solved" grade prevented puzzles with a specific technique from being found in the library.
