riched20: Create undos in StreamIn at the right times. Adds tests for when StreamIn should be undoable.

This fixes a winapi_check warning.

This fixes a winapi_check warning.

This fixes a winapi_check warning.

This fixes NTLM authentication with Outlook2003.

Remove some no longer relevant fixmes.

Fix a typo in rpcrt4_conn_open_pipe where the initial setting of dwFlags 
was done inside the switch statement instead of at the indented place of 
at the start of the block (thanks to Jan Zerebecki for noticing this bug).