added license for doxy2swig.py to 'Gaia Licensing.txt'
added license for doxy2swig.py to 'Gaia Licensing.txt'

MTG/gaia,kartikgupta0909/gaia,MTG/gaia,kartikgupta0909/gaia,ChristianFrisson/gaia,kartikgupta0909/gaia,ChristianFrisson/gaia,MTG/gaia,ChristianFrisson/gaia,ChristianFrisson/gaia,MTG/gaia,kartikgupta0909/gaia