Working directory for UGENE GUI

When users save output files they can specify a relative path, e.g. "test.fa" instead of "D:/test.fa". In this case, the file will be created in a working directory. Usually, the working directory for UGENE GUI on Windows is "C:/Program Files/Unipro UGENE/", so UGENE will try to save the file there. It is a bad decision to change data in the installation directory. Also, it is possible that a user hasn't permissions to write there.

Solution: change the working directory of the UGENE GUI process to "UGENE_data". Create this directory if it does not exist before using it.