Improvements to help new players

Version 1.35.0 includes some measures to help new players get started. There are also some tweaks to the scoring and more improvements to the help explanations. The changes in detail:

• If new players miss the section of the introduction that explains how to use the controls, then an additional button is shown below a puzzle in play. This button provides a quick way to view the how-to-use guide. Annotations are used to highlight the existence of the new button and also the help button.
• Some small tweaks have been made to the scoring, with the aim of evening-up the score rate (points/min) for the different puzzle sizes and levels of difficulty. In particular, players will usually be rewarded with more points when very difficult puzzles are solved.
• More improvements to the help explanations, especially for some of the help that new players typically see first.
• A problem by which a group of selected squares in a row or column was not always being replaced correctly by a new selection has also been fixed.