demo/triang.t
non-lazy yproc and yield
lazy yproc and yield and Ty (and temp fix in expr.go)
add ytriangs_lt to demo/triang.t
commands return, break, continue (but no handling them)
handling return, break, continue
upvar command and test; convert TScope to Loc & Slot
Th and commands: hash, hget, hset, hkeys, hdel
Eliminate T::Bool() in favor of Truth().
Eliminate TTruth, favor T::Truth().  Add T::Hash().
Add T::QuickList().  Rename ListElement to ListElementString.
add T::QuickReflectValue()
change T::QuickList() to T::IsPreservedByList()
Eliminated uses of -w T[a-z] outside of terp.go
Saturday gofmt -w *.go
always use "set" never "get"; demo/all.sh; reflections.go1.0.3
proc big_factorial using /math/big in demo and test.
rename Scope, Command, CmdScope
rename TGetVar etc.
Stealing More T's