[chimera-dev] new chimera.fileInfo.register interface

[Greg Couch]

There are now two additional keyword arguments to chimera.fileInfo.register:
category and dangerous.

The category should be set to one of the built-in categories or one
you invent.  The categories are meant to help organize all of the
file types chimera can open.  A set of default categories has been
created, chimera.FileInfo.X where X is DYNAMICS for a molecular
trajectory (amber), GENERIC3D for generic 3D objects (vrml, bild),
SCRIPT for command scripts (python, midas), SEQUENCE for molecular
sequences, STRUCTURE for molecule structure (pdb, mol2), SURFACE
for molecular surfaces (grasp), and VOLUME for volume data.

The dangerous flag defaults to True for scripts and false otherwise.
You can override that default by giving the keyword.

So far, the categories have only been added to the default file types
in the chimera module and to the Midas module.  Please update your
uses of chimera.fileInfo.register in the extensions you maintain.

	- Greg