Changed BroType to track a char* instead of an ID* that represents
the declared type's identifier. It was also necessary to serialize
this information or else it can be lost (e.g. FieldDecl's in RecordType
always seem to get serialized at some point).
DescribeReST() functions added to many classes to get the output
closer to being reST compatible; still needs tweaking for Sphinx
(reST->HTML) compatibility.