Feature request: Basic interactive purging

[Jarno Suni]

This is what is requested for the command:

Usage (using short options):
linux-purge [-cmnsy]
linux-purge {-h | -v}

Purge versioned kernel packages according to user's orders. Purging is
not restricted to linux-image packages, but all versioned linux-*
packages matching desired releases. Also purges such versioned
kernel packages that have the respective linux-image package missing
or marked for removal or purge, and packages that have just
configuration files remaining. Does not purge such versioned kernel
packages that have respective successfully installed linux-image
package marked with "hold" unless chosen interactively with -c option.

Options:
    -c, --choose Choose interactively which kernels to purge. Other
                    options determine which kernels are selected to
                    start with. If environment variable USE_DIALOG is
                    set, use dialog instead of whiptail as user
                    interface, if it is installed.
    -h, --help Display this help and exit.
    -m, --manual Purge kernels that have been marked as being
                    manually installed.
    -n, --no-legend Do not display legend in checklist used by -c.
    -s, --simulate Dry-run; do not actually remove packages. You may
                    run this as regular user. Note that in some cases
                    simulation is not complete since some actions may
                    depend on others being done for real beforehand.
    -v, --version Print version.
    -y, --yes Purge without user confirmation.

Exit Status:
    0: Command finished successfully.
    1: Command-line is invalid.
    2: Command was run with wrong privileges.
    3: Command failed for some other reason.

Fund the fix here: https://www.bountysource.com/issues/38892663-feature-request-basic-interactive-purging