retain srcloc in instrumentation for better debugging
split out instrument-analysis.rkt
simplify analysis inferface
split out binding analysis into separate pass

Also, improve fixed-point support.
add conditionable-context analysis
switch to logger for compile-time info
add run method to more stochastic ctx classes
added particle filters
particle-filter: add contracts, include in prob/main
viz/multi: add auto scaling
particle filter example
misc dist fixes
update todo
split out stat.rkt
removed dead code, rename var
clean up, add batch stats
moved KS code
update todo
moved contracts to main, delete obsolete lib.rkt

avoids mentioning private modules in errors
update todo