Fixes the following issues with the Windows delta updates: (1) msexec.exe fails with an error dialog because bspatch produces a malformed MSI on Windows XP, (2) 32-bit setup.exe fails to find the currently installed MSI to apply bspatch to on 64-bit Windows.
Replaces a use of wc.exe in resources\install\build.xml with the length Ant task as suggested by Damian Minkov.
Make sure bash commands executes correctly if name of resulting dmg has spaces in it.
Make it impossible to create a Jabber account without a server specified (either as part of the user name or in the server field).