#2 NegativeArraySizeException when deleting mails from POP3

[Nils Durner]

This patch fixes a "NegativeArraySizeException" when
the user tries to delete a mail from a POP3 server.

The exception is like this:
---
setting message flags
java.lang.NegativeArraySizeException
at
net.wastl.webmail.server.WebMailSession.getSelectedMessages(WebMailSe
ssion.java)
at
net.wastl.webmail.server.WebMailSession.setFlags(WebMailSession.java)
at FolderList.handleURL(FolderList.java)
at
net.wastl.webmail.server.ToplevelURLHandler.handleURL(ToplevelURLHand
ler.java)
---

[Nils Durner]

Fix POP3 deletion