Fixed a lot of indentation inconsistences.

There were a lot of indentation inconsistences: 1 space of indentation,
either 3 or 4 spaces, TABs. It is important, for several reasons, to follow
the PEP 8 recommendations.
Fixed a bug that appeared when splitting the ``acsPackageInfo-redhat-X.Y.rpmref`` lines.

There were two problems:

    * the separator was the default one (whitespace) instead of '-'
    * there was no error control for a wrong number of values to unpack