commit-email.pl violates rfc2822

[Doug Claar]

rfc2822 section 2.1.1 specifies that "Each line of characters MUST be no more 
than 998 characters...excluding the CRLF." (http://www.faqs.org/rfcs/rfc2822.html)

commit-email.pl has no mechanism to check/enforce that; thus, a large checkin 
of many directories will create an email message that violates the rfc. I 
could not find an existing bug for this problem.

Doug