Tiny performance gain
Tiny performance gain

@jolting the cost of "CPose2D + CPose2D" is 50% more than
".composeFrom()", although in overall we are speaking of nanoseconds...
;-)
"Just for fun", the reference is:

http://reference.mrpt.org/devel/perf-html/results_1.2.0dev-GCC-64bit.html

MRPT/mrpt,MRPT/mrpt,MRPT/mrpt,MRPT/mrpt,MRPT/mrpt