Add support for boost filesystem v3

+ add support for filesystem v3
+ keep support for filesystem v2 because squeeze still have boost 1.42
  which doesn't support filesystem in version 3. After dropping squeeze
  support we can remove v2 code.
Remove support to ipk version 2.1

+ remove generating old files from ipk2szarp app. Now it can be used
  only to test if szarp configuration is valid.
+ remove functions that saves old format files
Remove ISO-8859-2 from libSzarp2

+ removed setting encoding while saving xml files in libSzarp2
building unstable