detect 0.3.0 also on 64 bit installations

Some distributions decided to not use lib and lib32 on 64 bit systems,
bit lib64 and lib to always have 32 bit libraries in the lib dir.
Debian and openSUSE seem to do that and we have to care especially about
0.3.0 being in openSUSE 12.3.
padd track_* just in case 1st track != 1, re #24

The first track shall always be 1, though, as per the standard.
Merge branch 'master' into isrc_api

Get the padding fix for when 1st track wouldn't be 1.
(amended manually for track_isrcs)