Fix for an error when copying nodes

When copying a node to a directory that's outside the current path, the
"parent" node doesn't really exist, so the code raised an error.

NERDTreeFind fix revert

Some other changes causted previos commit to break the NERDTreeFind functionality
instead of fixing it. Reverting...

vimrc files(such as perdirvimrc) after BufRead.

NERDTreeFind fix

Fix for issue #22 -- "FUNCTION: NERDTreeAddNode() cannot handle paths with spaces"

Set curPathComponent to 0 correctly identify with indent level of node.

Shortening this line doesnt add anything to the UI (functionally
speaking), but removing frees up an extra line. Anyone who sets
NERDTreeMinimalUI probably uses the u/U mappings anyway.

Use \V for the updir text regex. Otherwise '..' is treated as a regex
rather than 2 literal dots.

Conflicts:
	doc/NERD_tree.txt

previously such dirs always appeared to be empty

Previously, if we called NERDTreeFind for a file that was inside a
symlinked dir (when vims CWD was above that dir) then it would get
confused by the symlink and fail. Use :p with expand to get around this.