shortened task command names; initiated tunables; made sure that all
nodes are used in alignStructures if none is selected; changed
openStructuresTask to get a network as argument and not a view; renamed
task to showDialog;
Restructured (initial values, names) tunables
Renamed tunable
Fixed some bugs (smiles association and NPE when Chimera is not
launched) and set all nodes to be selected on Close task as well.
Added nogui tunables for commands.