vim-patch:7.4.{1107,1114,1116,1117,1120}

vim-patch:7.4.1755
this prevents a crash when the list is used in setreg() later

New ex commands: 'tcd', 'tchdir'
Changed Vimscript functions: 'haslocaldir', 'getcwd'

The ex-commands ':tcd' and ':tchdir' are the tab-local equivalents of
':lcd' and ':lchdir'. There are no new Vimscript functions introduced,
instead the functions 'haslocaldir' and 'getcwd' take in optional
arguments. See the documentation for details

Since there is now different levels of local directory a simple boolean
at source level is no longer sufficient; a new enumeration type is used
for the scope-level from now on.

The documentation has been accommodated for these new commands and
functional tests have been written to test the feature.

Problem:    delete(x, 'rf') fails if a directory is empty. (Lcd)
Solution:   Ignore not finding matches in an empty directory.

https://github.com/vim/vim/commit/336bd622c31e1805495c034e1a8cfadcc0bbabc7

Problem:    delete() does not work well with symbolic links.
Solution:   Recognize symbolik links.

https://github.com/vim/vim/commit/43a34f9f74fdce462fa250baab620264c28b6165