o.c.display.pvtable: Move lib/ used by tests to test plugin
o.c.display.pvtable: Default tolerance for tests 0.01
o.c.display.pvtable: Add PVTableAutosavePersistence reader
o.c.display.pvtable: Add 'write' to autosave file format
o.c.display.pvtable: Use XML or autosave format based on file extension
o.c.display.pvtable: Use to handle ".sav" files
o.c.display.pvtable: Display enum as number and Label

Number is what's saved and compared, so it should be displayed, but
label is still added to the table for information
o.c.display.pvtable: Read doubles, fall back to Long if that suffices
o.c.display.pvtable: Add XML schema, update help, inc. version
Merge pull request #678 from ControlSystemStudio/proj673

PVTable: Support 'autosave' file format