fix IO::writeHotSpotFiles, fix calculation y-coordinates for non-uniform TSV densities
update/fix IO::writeHotSpotFiles, pre-calculate bin's lower-left corners and dimensions
for non-uniform TSV densities; use float precision; consider to shrink dimension of last
row/col in order to fit bins into overall chip outline
fix octave script: consider non-uniform TSV densities for initial thermal analysis / for
generation of initial HotSpot input data