! understand run_simul

* My Makefile as given to Shane; or, my yamm & etc.
* Fix up beaut so it does what I want w/r/t _() and 2sp/tabs
* Check for nice alignments (if any) lost by beaut
* print out documentation.pdf
* doc: the C library code, *and* the command-line interface
* Make it reentrant
* algo# == 11 -> algo# == name
* replace junk.in with a here-document
! .h update in run_simul ..................

* code divisions:
  - opts_t
  - defaults for opts_t
  - inner loop
  - MCMC steps
  - RVs computation
  - RV analysis
  - file input
  - file output