Need to wait until the internal fan out threads have been launched and acquired the testable mode lock before continuing with app starting and testing to avoid race conditions.

wip: fix propagation of initial values from control system variables (persistence layer) and device registers (just the current value)

Device support for history

device_support_for_history

add two more ignores related to eclipse projects.

This is needed to add all device variables to e.g. the history module.

Connecting a device only works if the PVs are readonly! So one has to
use the logical name mapping backend. This also allows to select only a
subset of the device PV to be added to the history module.