added the option to toggle window on trayicon click.
don't make GtkTextView auto-expanded in prefs dialogs.
added an option to use external program for printing.
added an option to inherit recipients on reply to self messages.
src/prefs_common_dialog.c: fixed a typo.
added the option 'Remember last selected message'.
added the option 'Open inbox on startup'.
implemented tray icon in Win32.
modified Common prefs - Details - Interface.
added Windows-1257 encoding for Baltic.
added an option to filter junk mails before normal filtering.
updated po files.
fixed menu strings in keybind changer.
added the option for MIME filename encoding method.
use filename-safe string for IMAP cache directory.
added Arabic encoding, and 2.2.0beta7 release.
removed 'Wrap before sending' option, which was rather problematic.
perform show/hide on trayicon click. Implemented popup menu on trayicon.
added Windows-1252 for display encoding.
moved outgoing encoding option into Display - Encoding tab.
modified 'filter sent messages'.
reorganized the common prefs.
moved the position of Spell tab.
Fixed window focus after closing quote colors dialog.
fixed crash when quote colors dialog was closed by the window close button.
implemented spell checking.
don't show gpg warning on win32 by default.
hide options which is useless on win32.
moved the location of fallback_encoding.
added preset menu for junk learning commands.
added an option to mark filtered junk mails as read.
moved fallback encoding setting to Advanced tab.
fixed focus problem in win32.
added fallback encoding setting.
added a setting to delete filtered junk mails from server.
win32: made the default editor command 'notepad'.
added the default browser to the option of URI command.
win32: use ShellExecute() to open URI.
enabled the property of the top folder.
modified the display of folder view.
separated UI code from prefs_common.c and prefs_account.c.