o.c.pvmanager.feature: adding file datasource
Adding to the main feature, like sys and sim.
o.c.archive.reader.channerarchiver: tentative fix for displaying disconnect in databrowser
org.epics.util: should export new stats plugins
o.c.archive.vtype: fixing VNumberArray implementation to new spec
org.epics.util: update to 0.2.5
org.epics.vtype: update to 2.4
org.epics.graphene: update to 0.5
o.c.u.pvmanager.*: update to 2.4
Merge pull request #358 from gcarcassi/master

New pvmanager version and databrowser disconnected  sample fix:  Fixes #328