base: Add 'Env::finalize_initialization'
Test for 'Parent::resource_request' interface
os: Add resource balancing-support to 'Slave'

In order to be able to dynamically balance resources of slaves, we need
to provide an accessor to the slave's RAM session and a way to issue
yield requests.
Test for yielding resources
terminal_mux: Add 'j' and 'k' keybindings
terminal_mux.run: LOG output of terminal_log

This patch tweaks the route of 'terminal_log' such that a LOG session
request of this program is directed to the parent rather to itself.