changes to makefiles / build system

[Pablo d'Angelo]

Hi!

changes to the build system:
 o moved hugin application specific data (po files, images etc)
   into the hugin subdir. I like this more than linking it (doesn't work
   on windows).
 o locale_path is not reset to "../po" to the config file all the time.
 o hugin looks for xrc (and their data) and po files under the current
   directory. if they can't be found it checks locale_path and xrc_path
   from the config file / registry
 o added hand written configure script. maybe its a good idea to
   create one with autoconf with more checks.

ciao
  Pablo
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