Fixes #2530913 - Minor doc tweaks Added @main tags to modules that YUIDoc failed to find the proper main module description. No build was done, only modified source files.

Cleanup of submodule declarations for apidocs.

Fixed module/submodule descriptions for anim/dataschema. TODO: links to submodules still broken for anim submodules

Y.log() src -> module or submodule names.

datasource-textschema plugin and tests.

Plugin ._owner to .get('host') and minor cleanups to fix broken tests.

XPath support. Also added DataSchema.parse() helper that calls field parser, and added Parsers shortcuts.

First pass at DataSchema.XML and DataType.XML.

dataparser -> dataschema