let's be consistently case-insensitive with respect to the xml tags
Revert "let's be consistently case-insensitive with respect to the xml tags"

This reverts commit 2eb0c5e11da9b00f8675688841ba118b91aa7471.
use 'gunzip -c' instead of 'zcat' for better cross-platform compatibility

zcat is identical to "gunzip -c", but Mac OS X doesn't ship with zcat.