Merge pull request #1 from ganglia/master

Update ganglia master
Don't global unused variables.
Get rid of global debug call to save time in production.
Micro-optimize globals inside the XML parsing functions
Merge pull request #252 from cddude229/microoptimize-xml-2

Micro-optimize XML calls
Merge remote branch 'upstream/master'
Only initiate "zoom" when left mouse button is depressed. This change avoids interference with right mouse click to initiate alternate action such as getting image properties.