[gamma.geocode] create new SAR scene object import on start
[gamma.geocode] create new SAR scene object import on start

..to prevent modification of any input object; e.g. if a SAR scene is
processed twice to different directories then the first call to geocode
will modify the object's scene attribute during unpacking (i.e. from
the zipped archive to the unpacked directory) which can then not be used
by the second call to geocode if the unpacked directory has been deleted
by the first call

johntruckenbrodt/pyroSAR,johntruckenbrodt/pyroSAR