src/EngEphemeris.cpp: Small changes in methods EngEphemeris::svClockBias() and EngEphemeris::svXvt() in order to improve speed and computing accuracy.
src/EngEphemeris.cpp: Small changes in methods EngEphemeris::svClockBias() and EngEphemeris::svXvt() in order to improve speed and computing accuracy.

git-svn-id: 6625e4d6743179724b113c04fbf297d122273a36@161 108fab2b-820f-0410-9f2c-e5cc2c41d7be

ianmartin/GPSTk,ianmartin/GPSTk,ianmartin/GPSTk,ianmartin/GPSTk,ianmartin/GPSTk,ianmartin/GPSTk