Ignore generated files.
compile.go.  Dumb implementation of CompileSequence().  Improve terpString::IsPreservedByList().
Merge pull request #9 from MrWerewolf/ignore

Ignore generated files.
s/T::Truth()/T::Bool()/ -- more consistent with T::Int(), etc.
use Tcl bool, not Python bool: only numbers are T/F
Optimizations to avoid expensive ParseExpression()
Logging Control:  sh log.sh on|off
tolerate missing USER in run1