adds csn
fixes #269
updates pricing scheme

scn_id replaced by prj_id
Fixes bug "Grid update after entity "

When a user creates a new entity and leaves the entity form before
saving, updates the grid and then comes back to this form an error
occurs.
adds csn clustering form (#12)
fixes "creating a run without opening runs node"

In the case that a user created a run from the sim params form without
having opened the runs' node, then a bug would occur and the new run
would not show up in the runs grid.
updates pricing node in tree and pricing grid

scn_id replaced by prj_id
Houskeeping and minor fixes
Housekeeping