Updates + Fixes

Sep 29 2012: 1.6.1: Major security fix & updated code for newer PHP version.
Apr 10 2009: 1.6: Solves harder sudokus. Fixed XSS flaws.
Apr 05 2009: 1.5.3: Notices invalid sudokus.
Mar 16 2009: 1.5.2: Outputs stats, halts endless loops, performance increase.
Mar 14 2009: 1.5.1: Coding refinements. (Should be faster?)
Feb 12 2008: 1.5.1: Valid XHTML 1.0 Strict again (new design was interfering).
Jan 26 2008: 1.5.1: Removed bug that did a include() error.
Jan 24 2008: 1.5.1: Forced to redirect, output shows new found numbers.
Jan 09 2008: 1.5: Removed a bug that caused a foreach() warning
Dec 31 2007: 1.5 [BETA]: Smarter; Output bugs removed; slight style changes
Dec 09 2007: 1.4: header() redirection = faster; bug fixed; removed unnecessary str_splits; minor style changes
Dec 07 2007: 1.3: Solves more (= harder) Sudokus.
Nov 28 2007: 1.2.2.1: Puts out valid XHTML 1.1 (again).
Nov 27 2007: 1.2.2: New function - redirect.
Nov 24 2007: 1.2.1: Should parse a bit faster.
Nov 03 2007: Version 1.2 released

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