Remove some PHP warnings in non-content pages

Fix #715800: type-specific settings act as default settings only, not as a type-wide configuration switch

Fix #631760: add query string to user-specified print.css to force browser reload after cache is cleared

Update changelog

Fix #566138: add setting to close the window when both the new window and send to printer are enabled

Don't try to use URL aliases when the node doesn't have one

Fix a notice with undefined node->type when printing system pages

Fix #361107: Ensure that per-node configurations are available for block view use
Revert #349991 until the cause of #359343 can be determined

Fix #349991 by moshe weitzman: Use node build_mode instead of custom property for customizing node fields
Fix #351043: Add specific permission to edit the node-specific settings
Fix #356073: Check for CSS file before expanding it and replace spaces with %20 in mails sent

Fix #247578: Print URLs by content type
Fix #298063: Most printed, emailed and PDFd blocks