Add ability to dump headers or mimetypes for original messages.
Add ability to dump all messages, instead of just hashes listed.
Add new command cmd/headers to import all headers from messages in table
original. Utility can work incrementally or do fully table imports.
Moved 'fetch all original messages' code to db/util.go. Added conditional
version given table name that will only return original messages that do not
have matching hashes in the specified table.
Go tool for reading original messages from DB and filling out contact table.
SQL scripts for building address book table from most commonly referenced
names per unique email address.
