The main changes are:
(1) Changed the hash function used to generate the 6-character
suffix for generated device cell names. The original hash
function is not good for ensuring unique names, and can
cause cell name collisions (two different parameter sets
having the same cell name). The chance of name collisions
should now be diminishingly small.
(2) Modified the string passed to the hash:
(A) Ordered the parameter names alphabetically, since iterating
through dictionary keys is not guaranteed to be in any
specific order, leading to different strings for the same
parameter set
(B) Normalized numerical parameters, so that "2", "2.0", "2e0"
are all hashed the same, again to avoid having multiple
cell names for the same set of parameters.
(3) Fixed a problem in which when changing parameters for a cell
instance, the instance would become unselected and the instance
name would be lost and revert to magic's auto-generated name.
(4) Fixed the annoyance of having a pop-up dialog whenever magic
decides that a parameterized cell name is not being used anywhere,
and it can safely delete the cell.
(5) Fixed an issue where the check for whether a cell can be deleted
is not run consistently.
The result is, I hope, a much more pleasant experience with generated
cells.
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