Add --more option to lorenz

Permits outputting second moments x*x, x*y, x*z, y*y, y*z, z*z.
Some restructuring of the scheme-specific switch to avoid duplication.
Add suggested lorenz pipeline
Kahan variant adding final error to sum

Closes #13.  Turns out to make no difference on some test cases
but seems like a not-bad-thing-to-do-anyhow.
Permit --burn=0 in Lorenz issue

Fix closes #11.  Permits (harmless) negative burn-ins.
Update copyright year
Use long double time

Accumulation error can build up in the simulation time.
Mitigate by using a larger accumulation type.
reorder includes
Provide hooks for compile-time precision selection
Permit precision selection at build time

Uses new $PRECISION environmental variable
Reduce dependencies of the 'check' target
Add -march=native to HOWFAST defaults
remove -march=native
update .gitignore
Change HOWSTRICT based on CXX for Intel
Ensure /usr/bin/time installed
Add missing period
Add GNU parallel runscripts for parametric study
Merge branch 'master' into develop

* master:
Merge branch 'release/0.1.2'

* release/0.1.2:
  Add GNU parallel runscripts for parametric study
  Add missing period
  Ensure /usr/bin/time installed
  Change HOWSTRICT based on CXX for Intel
  update .gitignore
  remove -march=native
  Add -march=native to HOWFAST defaults
  Reduce dependencies of the 'check' target
  Permit precision selection at build time
  Provide hooks for compile-time precision selection
  reorder includes
  Use long double time
  Update copyright year
  Permit --burn=0 in Lorenz issue
  Kahan variant adding final error to sum
  Add suggested lorenz pipeline
  Add --more option to lorenz