- added extensive doxygen  documentation of the derivation and
    final expressions that are implemented in the code
  - passes previously-failing test-cases with eccentricity>0
  - also fixed up old LALGetBinarytimes() in BinarySSBTimesTest, in order
    to make that test pass [and still do something useful for future refactoring
    optimization of XLALAddBinaryTimes()]
  - fixes #1074, #1142, #1043
Original: 3e24d704736284a25df51893a5fec7bf03ca1193