moved logic concerning slots representation in template from exil-env:make-tmpl-object
- added (doslots name default template) and (slot-default tmpl-object) to templates.lisp
- used these in exil-env:make-tmpl-object
make-tmpl-object now makes clips/nonclips distinction only when extracting value
from slots-specification (make-tmpl-obj-clips and make-tmpl-object-nonclips no longer needed,
conditional moved to get-slot-val)