Added operation for getting RasterLayerInfo from name or path.
Added task for displaying ARG raster info.
Fixes to gtloader
Added raster data type in layer information for admin site.
Fixed tiled mtsthelens rasters.
Refactored how cache is given propagated through catalog.
Merge remote-tracking branch 'upstream/master' into cache/fix
Set in RasterLayerInfo whether or not the layer is cached.
Fixed path in metadata for converting tiles.
Fixed metadata for mtsthelens rasters in test data.
Improvements and bugfix to remote execution of operations.

This checkin resolves one bug where operations designed for remote
execution were not being dispatched, adds a "remote()" method to
operations for sending an operation for remote execution (as opposed
to dispatch() which sends an operation's children), and adds some
documentation.
Merge pull request #496 from lossyrob/cache/fix

Fixes to cache propagation
Merge pull request #497 from joshmarcus/topic/remote

Improvements and bugfix to remote execution of operations.
Added a convert-all command to batch convert.
Merge pull request #503 from lossyrob/gtloader/batch

Added a convert-all command to batch convert.