Bugfix: disable debugging comments in SVGPlots and
MongoEpigeneticsWrapper
Bugfix: use types_index to tell if you need to replace types/sample
index, because you will always have a types index, but will not always
have a sample index (wave format data). 
Bugfix: query form was incorrectly using = instead of == operator.
Bugfix: set defaults for chip and methylation samples to "all" to
prevent crashes.