Fix one element tuple to be actually tuple.

While in this case it doesn't mean much (neither `z` or `-` would be
passed to options parser), it makes things possibly less buggy.
Updated help text of fish_config command
Set of changes to improve detection of escape sequences for prompt width
computation. Addresses #767
Complete apt-get purge identical to apt-get remove

As apt-get purge really has the same operations as apt-get remove, there is not reason to handle them differently in its completion file.
Fix for bug where fish fails to source config files if the path contains
a space
Fix fish.app for directories with spaces. Fixes #774
Support term256 in config.fish. Fixes #1022.
Update docs to describe autosuggestions. Fixes #937
Make tok_last_type return an enum token_type instead of int
Better error messages for `EDITOR=vim git...` type commands.
https://github.com/fish-shell/fish-shell/issues/809
Strip out git commit numbers from doxygen documentation
Support implicit cd with appended `/`.

This is an experimental feature, proposed in the issue #22.
https://github.com/fish-shell/fish-shell/issues/22#issuecomment-20483478
Restore directories' tab completion without slash in command.

This is needed for implicit cd when ending command with `/`.
Fix git completions when aliased command is not found.
configure: use C++ for all tests, kill CFLAGS