Do not attempt to filter duplicate packages in install

Mathieu Bouillaguet recently reported a bug by e-mail. He had added the
following URL to the repository list:

http://www.slackware.com/~alien/slackbuilds/

For example, the flashplayer-plugin package was showing these versions
from list-versions:

Available versions:
    flashplayer-plugin:
        Local:  flashplayer-plugin-11.2.202.310-x86_64-1alien
        Remote: ./flashplayer-plugin/pkg/13.37/flashplayer-plugin-11.2.202.327-i386-1alien.txz
        Remote: ./flashplayer-plugin/pkg/14.0/flashplayer-plugin-11.2.202.327-i386-1alien.txz
        Remote: ./flashplayer-plugin/pkg/14.1/flashplayer-plugin-11.2.202.327-i386-1alien.txz
        Remote: ./flashplayer-plugin/pkg64/13.37/flashplayer-plugin-11.2.202.327-x86_64-1alien.txz
        Remote: ./flashplayer-plugin/pkg64/14.0/flashplayer-plugin-11.2.202.327-x86_64-1alien.txz
        Remote: ./flashplayer-plugin/pkg64/14.1/flashplayer-plugin-11.2.202.327-x86_64-1alien.txz

Yet when trying to install it, only the two distinctive versions:

flashplayer-plugin-11.2.202.327-i386-1alien.txz
flashplayer-plugin-11.2.202.327-x86_64-1alien.txz

Were being offered, with the first URL they appeared in:

Local: flashplayer-plugin-11.2.202.310-x86_64-1alien
Choose option:
    (1) ./flashplayer-plugin/pkg/13.37/flashplayer-plugin-11.2.202.327-i386-1alien.txz
    (2) ./flashplayer-plugin/pkg64/13.37/flashplayer-plugin-11.2.202.327-x86_64-1alien.txz
You choose option...

The inconsistency has been removed in favor of the desired behavior for this
real use case: no filtering has to be done when in the install-related
operations family.
Bump version number