folder handling fix

initial commit using a very minimalistic db abstraction preparing to add postgresql support as well

preparing for database consolidation

added memcached support to pilerimport

got rid of ipv4 specific code from imap/pop3 importing

code cleanup and added server_id to the store path

code clean up in folder.c

issue a warning and keep the message if it cannot be imported

fixed a bug in imap parser

eliminated the mydomains piler.conf

fixed a pilerimport counter

added pop3 support for pilerimport

added SSL support to pilerimport

finalized google free apps support

added a utility to contrib/imap that adds seen flags to all messages in INBOX

added recursive folder support to pilerimport

added folder support for piler daemon and pilerimport

improved message parsing

iconv fix, pilerimport can handle up to 1024 mbox files

added >2GB file support for pilerimport

added progressbar-like counters to pilerimport

fixing a parser bug in process_imap_folder()

added a few parser tests

fixed pilerimport return values

pilerimport can retrieve messages from imap4 servers, too

pilerimport now handles correctly the case if the file is not readable

pilerimport can read single emails from stdin specifying "-" as the filename

pilerpurge fix

added tagging the search results

added retention rules to piler core