Ndjson bug

[jameskerr]

fixes #1660

Improve the Record#has method to check for the name and type of a field. Thanks to @mccanne , we can use strict equality to check the types of fields.

For example:

if (record.has("ts", zed.Time) {
  record.get("ts").toDate()
}

It also can check for more than one type by passing in more types:

if (record.has("_path", zed.String, zed.BString)) // ...

I also found some more code in the log detail area that did not get the syntax upgrade in #1645

They have been fixed and I moved the programs to the "programs.ts" file. I hope to have all zed programs localized to this file in case we need to change the syntax again.

Finally, I realized that if we had some integration tests covering the log detail pane, we would not have so many regressions. I plan to add some shortly.