some fixes.. context, custom titles,..

[jdlx]

dear chris,

i finally jumped.. on using GIT ;-) so here are my changes. Besides the custom titles change, and that one typo, i found the bug with the non working context option.. well at least it works for me now. The catch was getGroupedOpcodes() being called without the context option passed in Diff.php.. However: getGroupedOpcodes() is also being called in Array.php, Context.php and Unified.php.. again without the option beiing passed, and at this point i'm not sure whether that matters in some place or not..

well, goog enough for now.. ;) cheers, Jan