Avoid 'auto' for simple types.

Improved table header for 'dz'.

for the first time run under valgrind, found and corrected a bug in the curve refinement routine, which is a very careless piece of coding

RNG API in libtrivia has changed

Imposing -Werror.
Got rid of warning from xax_lex.cpp (%option nounput)

Conflicts:
	pub/src/fit.cpp