#29 validate57.exe didn't catch sphericalBounds problem.

[Stan Coleby]

From Sam Vesurai of HDS Leica Geosystems
validate57.exe tool did not catch this problem when an e57 file had:
<sphericalbounds type="Structure">
<rangeminimum type="Float">1</rangeminimum>
<rangemaximum type="Float">
<elevationminimum type="Float">1</elevationminimum>
<elevationmaximum type="Float">
<azimuthstart type="Float">1</azimuthstart>
<azimuthend type="Float">
</azimuthend></elevationmaximum></rangemaximum></sphericalbounds>
If sphericalBounds are given, they need to be correct and match the data.