DE1847 Product Export Fails XSD

Ensure that the default store is processed first explicitly, and explain why.
Should default store find invalid items, remove those items from the productId list so that subsequent stores don't try to reprocess.

Conflicts:
	src/app/code/community/EbayEnterprise/Eb2cCore/Helper/Languages.php
	src/app/code/community/EbayEnterprise/Eb2cProduct/Model/Pim.php
DE1760 Order Retry XML Missing

Check that the OrderCreateRequest attribute is non-empty before attempting to send. If it is empty, log at warn level and leave status unchanged.
Update Troubleshooting Guide with this information.
DE1884 Remove 'null' Value From 'CharSet' Node

Rename eb2corder/create::_xsdString method to eb2corder/
create::_restrictText method and change the return signature
to return a DOMText node with the XSD valid string.
Fix broke tests. In eb2corder/create::_buildBrowserData method
make sure to passed in the $maxLength of 50 as defined in the
XSD documentation for 'CharSet' node and null as the $default
parameter.