This makes error handling easier across clients and more consistent.
Also eliminates the need for users to parse their own URLs first,
because that doesn't even guarantee the URLs will be correct http URLs
Float values are not supported in the existing engine and the tsm1
engines. This changes NewPoint to return an error if a field value
contains a NaN field. It also allows us to validate fields to prevent
other unsupported types from sneaking in through other input plugins.
Cameron Sparr
Farshid Tavakolizadeh
Nicholas Katsaros
Jason Wilder