Problems remain with codedFixedValueFvPatchScalarField:
- readIfModified() notices change on system/codeDict, but the
codeProperties::setUnmodified() means that only a single entry will
get processed
- it appears that while dlclose() may (or may not) be actually closing
the library, there are probably still references about. This means
that a subsequent reloading still points to the original functions
and the lookup is not updated correctly.
