This plugin uses libarchive to extends claws-mails features to include
archiving of IMAP, LOCAL and POP account as well as calendar accounts.

Archives are created with the following option:

    format
	- TAR
	- PAX
	- SHAR
	- CPIO

    compression:
	- GZIP/ZIP
	- BZIP2
	- None

    recursive
	- Yes/No