fix image blurring issue in PGPLOT interface #48 #65
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… set the image interpolation algorithm; bump version to 1.5.0 due to incompatible interface
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fix to #48.
The giza_render routines now take an additional integer argument (filter) specifying the type of image interpolation to be used when rendering the image. A value of 0 gives the default behaviour (bilinear interpolation) but now when called via the giza-pgplot interface, the behaviour is forced to GIZA_FILTER_NEAREST which gives nearest-neighbour interpolation, as desired in Issues when testing the drop-in replacement for the fortran pgplot library #48.
updated C/tests/test-render.c for compatibility, and added this to "make check"