Bug#475266: third iteration

[Kevin B. McCarty]

Third iteration of mbox folding: take into account that header field
names (Subject, From) are case-insensitive, and allow tab(s) as well as
space(s) to follow them.

Sorry for all the noise, this should be the final version.

best regards,

-- 
Kevin B. McCarty <kmccarty at gmail.com>
WWW: http://www.starplot.org/
WWW: http://people.debian.org/~kmccarty/
GPG: public key ID 4F83C751
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