Fixes Issue 1116

Fixes Issue 1278
Fixes Issue 119
Fixes Issue 1077
Fixes Issue 1238

Worked performed by danapple0 and cketti in
https://k9mail.googlecode.com/svn/k9mail/branches/issue1116

Add support for most batch ops (except move and copy) in search
results.  Add support for batch move and copy on real folders.

Increase efficiency of bulk IMAP moves and copies by doing as multiple
UID operations.

Eliminated serialization of Account objects.

Provide up-references in useful places to make all future code cleaner
and more efficient.

Fixed a bunch of draft handling

Merged from issue1116 branch, except for Account.java, which was
copied wholesale.  Account.java was manually merged in issue1116
branch at r1489

svn merge -r 1459:1489 https://k9mail.googlecode.com/svn/k9mail/branches/issue1116 .
cp ../issue1116/src/com/fsck/k9/Account.java src/com/fsck/k9/Account.java