Remote whitespace at the ends of lines.
Remove blank lines from the ends of files.
Change modes on source files so that they
are not executable.

Signed-off-by: Dan Cross <cross@gajendra.net>

decode.c:146:8: warning: variable ‘argv’ set but not used
fs.c:953:47: warning: variable ‘reset’ set but not used
imap.c:348:6: warning: variable ‘prefix’ set but not used

Updates #114.

R=rsc
CC=plan9port.codebot
http://codereview.appspot.com/5429044

list message 1.
give correct contents for raw, rawheader, rawbody.
provide filename and charset in mime attachments.
only rename mailboxes named mbox* not mbox*.