sim: use Float64Arrays rather than objects for time slices
sim: only add stock initializer to initials if it is const
draw: skinnier connectors
build: jsdeps make target
sd: explicitly define sd on this
test: add (failing) tests for some floating point numbers
lex: correct floating point regex
vars: handle if/then/else in javascript emmision
vars: fix typo for multiple inflows
draw: better algorithm for calculating inverse flag for connector arc