Initial support for standard automation scripts.

This release has the initial set of changes to facilitate the complete automation of archiver configuration.

The repo https://github.com/slaclab/epicsarchiver_automation has an initial version of Bruce Hill's scripts that we are taking thru testing. This release has some performance fixes to accommodate these scripts.

In addition to the archivePVWorkflowBatchSize in the archappl.properties, there is a new entry abortArchiveRequestInMins (defaulting to a day) that will abort requests for PVs that have not connected for more than a the specifed time.