Web Service Fetch scripts

FetchData version 2014.253 was released with many changes since the previous release (2014.107).

Highlights include:

* Use POST capabilty of fdsnws-station service, which is much faster to transport and parse over the XML (support is required for 1.1 services).

* Many optimizations for large requests by re-organizing internal metadata handling and removing an unnecessary encoding check during download.

* Translate empty location strings in metadata to "--" identifiers for data requests.

* Add detection of stream truncation identifier, exit and print an error if present.