DirDiff v1.0.4

A few minor changes:

• Now accepts unicode text documents, the unicode text may still be converted to ANSI, but you still get to do a diff on most of the data!
• Diff on directories was using a verry slow technique, so this should work mush faster now.
  (And for who's interested it doesn't even take the real diff algorhythm, since you can sort the filenames in a directory)
• There was an issue with the 'unable to set visible in onshow' errors, especially when used from TortoiseSVN.

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