#3 Rework to address several issues; imprvoements

[Roman Benesch]

Thank you for this great tool!

I have fixed a number of bugs in Duplo, as well as extended it:

• C/C++-style block/line comment stripping sometimes leads to file parts
  being ignored (even when including the bug fix from Wilson Snyder)
• Duplicates are counted too often, when occurring more than twice. To
  be exact, duplicates are counted (n-1)! times. (If you have 4 files
  containing the same code, duplo’s result is 6 duplications instead of 3,
  as it matches the code between file 1 and 2, 3, 4; between 2 and 3; and
  between 3 and 4.)
• Memory leaks fixed as discovered by Ekaterina Antakova.

I have fixed the above issues, as well as extended duplo to also count code duplicates
within individual files themselves.

I am available to discuss the changes.

[Roman Benesch]

Please note I had to upgrade the project/solution files to DevStudio 2010.