Allow DeltavisionReader truncated files, expose plane offset method
Remove code duplication, add documentation
Add state assertions
Add the Aperio AFI pages
merge develop -D org -I include -E exclude: PR 159 (Improve .ndpi support)
merge develop -D org -I include -E exclude: PR 351 (Add SPW support to FakeReader)
merge develop -D org -I include -E exclude: PR 421 (Documentation for new Imspector format)
merge develop -D org -I include -E exclude: PR 435 (Fixes for March 2013 bug week (rebased onto develop))
merge develop -D org -I include -E exclude: PR 449 (Trestle: fix optimal tile sizes for subresolutions)
merge develop -D org -I include -E exclude: PR 451 (Fix the component retrieval methods in Index16ColorModel)
merge develop -D org -I include -E exclude: PR 454 (Add features to Deltavision interface)