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

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

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

Problem:    Vim can create a directory but not delete it.
Solution:   Add an argument to delete() to make it possible to delete a
            directory, also recursively.

https://github.com/vim/vim/commit/da440d21a6b94d7f525fa7be9b1417c78dd9aa4c

Set v:windowid as writeable (but read only in the sandbox).

References #3626

vim-patch:60cce2f

The new content from bf635102 is retained.

Update runtime files.

https://github.com/vim/vim/commit/60cce2fb736c8ff6fdb9603f502d3c15f1f7a25d

Update various runtime files.

https://github.com/vim/vim/commit/ca63501fbcd1cf9c8aa9ff12c093c95b62a89ed7