[dbohdan] 2015-03-11: `with-path` is to [cd] what [withOpenFile] is to [open].

======
proc with-path {path code} {
    set prevPath [pwd]
    cd $path
    uplevel 1 $code
    cd $prevPath
}
======

[DKF]: In 8.6, it might be better to do:

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proc with-path {path code} {
    set prevPath [pwd]
    cd $path
    try {
        uplevel 1 $code
    } finally {
        cd $prevPath
    }
}
======

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