Templates: demo/template.t is broken.  Attempting to recursively eval template blocks.
Templates: Removed template.go and replaced it with TempleTcl from the tcl wiki.
(http://wiki.tcl.tk/18175).  The minimalist implementation is in demo/template.t
Added commands: incr, append, and error.
Modified the "string range" command to more closely match tcl's behavior by
including the character indexed by "last".