So that the user knows their command has been sent to the server

This means building failed, but a previous instance is still running

and not only when the webrunner starts

This bug makes the display of "Running instance..." 2 times instead of one

runner: correctly displays the "run log" after the build step, even if the slapgrid process is very short in time

runner: /viewLog displays "Queue" for Run only if the run_instance option of slapgrid is set to true

bug described here: https://nexedi.erp5.net/bug_module/20140718-1A93B96

in page /viewLog

instead of guessing what's going to happen.
Upgrades on this file are yet to come

Also, return code of Popened-processes are now always read when they finish