SaVi 1.5.0b includes codefixes to SaVi 1.5.0a to prevent bugs:
- in tcl/constellations.tcl to prevent rounding errors when generating constellations
  (degrees such as 180 and 360 should be 180.0 and 360.0 to force floating point in Tcl.)

SaVi 1.5.0a includes two one-line codefixes to SaVi 1.5.0 to prevent bugs:
- in tcl/constellations.tcl to allow loading of unnamed TLEs (elsets) without a name error.
- in tcl/coverage_frames.tcl to enable better detection of gifsicle, if installed.
