gpstime: 'ligo_' to time math functions
timespec_add, timespec_sub shadowed names in version 4 kernels By giving them unique names that match the data structures they use, gpstime now compiles for kernel version 4
timespec_add, timespec_sub shadowed names in version 4 kernels By giving them unique names that match the data structures they use, gpstime now compiles for kernel version 4