NEWS,lib/,src/matrix.c,src/out.h,tests/calibrate_clino.out: Don't
report "Solving to find x coordinates" as we actually find y and z
in the same operation, and as a progress message it is redundant with
"Solving %d simultaneous equations" anyway.
NEWS,lib/,src/netskel.c: Tweak cavern .err file output to not lose
the space in front of certain statistics when the value gets large.