cleaned up and 'modernized' LALBarycenterTest somewhat

   - preparing further tests comparing optimized Barycenter() functions
   - refs #347
added empty placeholder API for optimized XLALBarycenterOpt() function

   - extended test and timing-measurements to optimized function
   - currently just wraps XLALBarycenter()
   - refs #347
equivalent re-writing of Curt's XLALBarycenter() function

   - modernized, simplified, increased readibility
   - test confirms binary equivalence
   - refs #347
increase verbosity of LALBarycenterTest: output exact offsets, and relative speed gains
applied 1st step of Miroslav's XLALBarycenterOpt() optimization: remove redundant computations

   * this patch removes all sin/cos re-computations, remaining
     binary-equivalent for a speed gain of ~26% percent (on Thinkpad T520)
   * refs #347
applied 2nd step of Miroslav's Barycenter optimization: buffering

   - buffer all sky-dependent and site-dendent quantities for re-use
     if applicable, total speed up now ~ 60% on Thinkpad T520
   - refs #347
implemented Miroslav's 3rd step: new option SSBPREC_RELATIVISTICOPT for LALGetSSBTimes()

   - produces binary equivalent SSB-timing numbers, should gain ~60%
     speed for fully buffered cases (and ~27% for unbuffered ones)
   - refs #347
Merge branch 'master' of ligo-vcs.phys.uwm.edu:/usr/local/git/lalsuite

Conflicts:
	lal/packages/tools/include/LALBarycenter.h
	lal/packages/tools/src/LALBarycenter.c
	lal/packages/tools/test/LALBarycenterTest.c
	lalpulsar/src/ComputeFstat.c
Post-merge branch 'master' of ligo-vcs.phys.uwm.edu:/usr/local/git/lalsuite commit
Merge branch 'master' of ligo-vcs.phys.uwm.edu:/usr/local/git/lalsuite
Merge branch 'master' of ligo-vcs.phys.uwm.edu:/usr/local/git/lalsuite
Merge branch 'master' of ligo-vcs.phys.uwm.edu:/usr/local/git/lalsuite
Merge branch 'master' of ligo-vcs.phys.uwm.edu:/usr/local/git/lalsuite
Merge branch 'master' of ligo-vcs.phys.uwm.edu:/usr/local/git/lalsuite
Merge branch 'master' of ligo-vcs.phys.uwm.edu:/usr/local/git/lalsuite
Merge branch 'master' of ligo-vcs.phys.uwm.edu:/usr/local/git/lalsuite
Add search over 3rd spindown in HierarchSearchGCT.

	- gamma3Refine is hardcoded to 1,i.e., this search is VERY slow!!!
	- conditional output of the f3dot values in the toplist.
	- make check passed.