Commit [r19712] Maximize Restore History

___JmolVersion="14.1.16_2014.05.11"

new feature: load ... filter "symop=..."
-- list of numbers separated by space, for example:
load quartz.cif packed filter "symop=2"
load quartz.cif packed filter "symop=2 3"

new feature: set echo depth x.x for standard echos
-- works for 3D echos now as well as 2D echos
-- values in percent of depth
-- x.x >= 1000 are (x.x % 1000) in front of the 3D position
-- x.x <= -1000 are (-x.x % 1000) behind the 3D position

hansonr 2014-05-12