v0.2 Import feature

I'd like to give some more details on the import feature which I've decided to include into v0.2 before its final release.

It will already be introduced in the beta release later this week.

The import function can handle .TXT and .RTF files. It handles zeros and spaces as empty sudoku cells and inserts the values. So basically, you can write your sudoku in any form (newlines and other characters (,!çù) are neglected).

I'm still squeezing some bugs out, but it already works nicely (see screenshots).

Greetings,

Force