Add warning for incompatible mimemail settings

Fix #364535: move custom text strings to separate form to prevent conflicts with the translation mechanism

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

Improve variable cleanup at uninstall

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

Fix #336065: change nodeapi content weight to make sure that the content area link is rendered first

Fix #315204: Add options to show only the current page in book links
Fix #314521: Use file:// access when accessing images if private file system is enabled