Provide more reliable location of errors

File names and line number information was not reliable available
when producing error messages. Some items have embedded line number
information, and sometimes the S#state.type and/or S#state.value
could be used to retrieve the line number information.

To make sure that we can always retrieve at least an approximate
error location, store the top-level construct being checked in
S#state.error_context. Example of top-level constructs:

  Seq ::= SEQUENCE {...}
  i INTEGER ::= 42

This is a short-term solution. In the long term, we would want the
parser to include line number information in all items.

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