add `toPrettyDuration` to prettify a duration

`toPrettyDuration` takes seconds and converts the value into a pretty
format with days, minutes, hours and seconds. It excludes all fields
that are unnecessary.

	modified:   web/js/coge/utils.js
add each jobs runtime to the status window

Will add the runtime of each individual job which has an elapsed field.
When the workflow finishes returns the total time each job took to
complete. The total time for the workflow is not entirely accurate due
to some jobs being run in parallel.

	modified:   web/js/synfind.js
	modified:   web/js/synmap.js
	modified:   web/tmpl/LoadExperiment.tmpl
	modified:   web/tmpl/SynFind.tmpl
	modified:   web/tmpl/SynMap.tmpl