* Support for the new GESHI_HEADER_PRE_VALID in geshi 1.0.8
* Strict Standards: Non-static method SyntaxHighlight_GeSHi::validHighlightRange() should not be called statically
* Break input validation out to a function so it doesn't mush up main program flow readability
* Reduce denial of service attack area by imposing an arbitrary limit on the size of line ranges
* Reject 0 as a valid input line
Some further notes:
* Currently, the line numbers given for highlighting seem to ignore the 'start' line number provided for displaying line numbers. This is IMHO a bit confusing; it might be better to add the start line number in so you can specify line numbers which match what will be displayed.
* You can specify line numbers after the end of the document without complaint. It might be better to count the lines and ignore any additional ones.
