derive mode from tabulated-list-mode
use tabulated-list-mode functions to render list
fix indentation
make column-order a custom variable
allow sorting on columns
split grid-engine-setup
bind g to revert-buffer
job-details function needs only job object, not field
rename mode to grid-engine-list-mode
C-u RET should open a separate buffer
on RET: only check for job, not for field
raise buffer: take optional mode argument