[ptx] new tutorial on TCA correction

[Pablo d'Angelo]

Hi all,

Now it happend! I wrote my first hugin tutorial, based on TCA correction
estimation howto, posted by Bruno ;)

Please take a look at my tutorial on estimation of the TCA correction
coefficients at:

http://hugin.sourceforge.net/tutorials/tca/en.shtml

Some parts of it are a bit technical (and might not be required for actually
correcting the TCA). I hope the tutorial is also useful for the average
hugin user who wants to correct TCA...
Please let me know if it isn't.

ciao
  Pablo