added the feature to save message as plain text (locale or UTF-8 encoding).
made 3.3beta1 release.
made 3.2.8beta8 release.
win32: added an option to play sound when new messages arrive.
libsylph/utils.[ch]: to_human_readable_buf(): new.
fixed an error when removing queued messages on win32.
Automatically select appropriate Junk folder on filtering.
disconnect all current sessions of remote folders when going offline.
update summary view on receiving on the fly.
made default_addrbook_func static, and made 3.0beta8 release.
updated def files.
remove_numbered_files(): made filename to number conversion unsigned (fixes undeleted IMAP caches with UIDs larger than INT_MAX).
added option to set only mail address of recipients when replying.
src/setup.c: check whether the specified location includes settings folder.
ignore case when checking mailing list post.
removed debug prints, updated def file and updated Windows ico file. Made 3.0.0beta2 release.
merged plugin-test branch into trunk.