OpenACS

- change labeling of list filter:

 * show current channel version (instead of just "current")

 * call selector for head packages not "head" but supplemental

- offer on "head" channel just these packages, which are not available

 in the current channel (this avoids a potential damage in the

 current installation, when somebody tries e.g. to install

 a core package from head, which is broken and/or older than

 packages in the current channel). Since there is no way to downgrade

 packages in OpenACS, such errors might be hard to fix.

- use message keys instead of hard-coded strings for maturity in

 www/install/install.tcl

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