Word splitting issues resolved

[vifon]

Example of the issue on zsh with autocd turned on:

~/directory % cat <<!
subdir1
subdir2
subdir3
!
[the output of cat]
~/directory/subdir1 %

The cwd has changed due to the heredoc lines being incorrectly split.

Another, much more threatening example:

~/ % ls
[the directory is empty]
~/ % cat <<!
touch newfile
!
[the output of cat]
~/ % ls
newfile

It actually may lead to unintentional code execution.