1. Fixed the representation of seconds fraction in datatypes
2. * in signature constraints is not recorded as a used symbol, eliminating spurious warnings.
3. Fixed the encoding of \# in the flora shell

git-svn-id: svn://svn.code.sf.net/p/flora/src/trunk@1209 0877669f-6caa-400d-a9c2-f8e882ed57a8
fixed persistent modules, which got stale after we added the context argument to Flora wrappers in the tries.

git-svn-id: svn://svn.code.sf.net/p/flora/src/trunk@1210 0877669f-6caa-400d-a9c2-f8e882ed57a8
don't use Emacs style quoting in error messages. unbalanced
single-quotes causes problems with quoted-string highlighting in Emacs
more backtick removal
add exercise
add cc_fPIC patch if needed in the future
fix naf -> \naf and stuff in visualizer