#157 handling of literals in lsub/list response

[Tomas Kuliavas]

SquirrelMail 1.4.9a (and older) fails to parse literals in LSUB/LIST response.

Sample responses:
----
* LSUB () "/" mail/a<b>a
* LSUB () "/" {11}
mail/a"<br>

* LSUB () "/" mail/test-again
----
* LIST (\NoInferiors \UnMarked) "/" mail/a<b>a
* LIST (\NoInferiors \UnMarked) "/" {11}
mail/a"<br>

* LIST (\NoInferiors \UnMarked) "/" mail/test-again
----

SquirrelMail already has some literal parsing fixes in sqimap_mailbox_list(), but it looks like they are not working in stable and compact_mailboxes_response() in devel works.

[Tomas Kuliavas]

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it is not enough to port compact_mailbox_response updates. other functions are also broken.