use lib perllib

Only the libraries needed for ml2json itself are included, not those
for html/gen.
fix doc
source doc
config doc
grammar fix
create IOStream
IOStream: add xopendir_pathstream
move ghosting classes to lib/Chj/Ml2json/Ghosts.pm

'Chj::Ml2json::Ghosts module'
factor out code into parse_email
create Chj::Parse::Maildir
testmaildir for testing or debugging
add maildirP, ezmlm_archiveP
comment about risk of oversight
add stream_map_with_tail
add as_string method to Maildir cursor
rename it to message_as_string

to prevent confusion (with cursor as string or so)
add functional setters
Maildir: add (Maildir/)ezmlm archive handling
Maildir: issue index numbering from the mailbox parsers for stable ids from Maildir
Maildir: update help text to maildir feature (and other previous changes)