…aints and add some '+' just in case
Add an option to enable --autoremove when removing packages (by default it's off). You can also enable it by setting OPAMAUTOREMOVE. The semantics is the following: * `opam remove <pkg>` will simply remove the package * `opam remove <pkg> -a` will remove the package and its dependencies * `opam remove -a` will remove all the packages which have not been explicitely installed (note: you can do `opam install <pkg>` to an already installed package to make it become a 'root' package which will not be uninstalled using `-a`).
Now, OPAM_PACKAGE_NAME and OPAM_PACKAGE_VERSION are available.
… In case no filename is given, import reads stdin and export uses stdout.