Change to project/trunk,tags,branches style

TODO

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+* Create meaningful Exception classes. Remove "Error" exceptions
+
+* Humanized error messages after Exception work done
+
+* Pisi command outputs overhaul
+
+* If possible remove context from pisi
+
+* autoxml is hairy and not maintainable. If possible replace it with a simpler and 
+  faster xml objectifier implementation.
+
+* We need to update some state file during the pisi operation to implement a transaction
+  like system. And take some actions after last failure of pisi for some reason.
+
+* Messages in log file are not very helpful. Log messages overhaul needed. We need detailed
+  logging.
+
+* Tidy pisi.api to satisfy necessary functions
+
+* Write a new unit test suite
+
+* Refactor code after unit tests are finished. Divide long functions. Rename 
+  necessary function and variable names (like A, B_C, D_, C) to understandable
+  ones
+
+* Add documentation to all module functions
+
+* Performance and memory usage optimizations
+
+* Version validator