Set VRML97 translation of IndexedFaceSets to specify `solid false`
unless the faces were explicitly indicated to have CLOCKWISE or
COUNTERCLOCKWISE vertex ordering. This is conservative, but otherwise
shapes may be "see-through" in undesirable ways, if the original
VRML 1 vertices are not ordered consistently with the VRML97 default.
Also fixes a typo/bug in picking up numerical values of parameters,
and ensures that fields in the output VRML97 are always separated by
at least a space, comma, or parenthesis.
