bash-completion

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_cd_shortcuts() is a Bash completion function to improve "cd" command adding two new shortcuts:

up : ^{number}

To go {number} directories up from current path, for example:

cd /usr/src/linux-headers-5.0.0-20-generic/arch/x86/kernel
cd ^4<Tab> → cd ../../../../

at : @<name>

To go to first {name} directory from the right to the left starting to current path.

cd /usr/src/linux-headers-5.0.0-20-generic/arch/x86/kernel
cd @src<Tab> → cd /usr/src

If ^ or @ are not detected it calls the original completion for "cd".

I've checked travis-ci logs and looks like that some error happened during tests on Debian 10 but not related with my PR.