- Don't write any archive entry to disk unless the package metadata
plist files are found.
- Always check for the package metadata plist files in the first 4
entries, if they aren't found stop the unpacking... invalid archive.
- Don't check for removing INSTALL/REMOVE scripts on each iteration when
extracting, just check it once before the loop.
- Add doxygen comments and related stuff.
--HG--
extra : convert_revision : xtraeme%40gmail.com-20100122225639-wameh8ls94bkm68h