idq_utils.py: added HDF5SeriesFeatureData to dump unevenly sized datasets of features to disk, gstlal_feature_extractor: fixed a bug in reporting trigger time for sine gaussian waveforms, chaged scheme on how to retrieve rows from buffer

gstlal_feature_extractor + idq_multirate_datasource.py: stripped out cheb downsampler in favor of stock resampler, added nxydump_segment options to dump timeseries to disk, lowered default Qlow setting

gstlal_feature_extractor_template_overlap: added html report + waveform plots for template validation

- for some reason inspiral.py has it's own, unmaintained, versions of command line parsing stuff that's in datasource.py.  I don't know what's going on, but the way it is doesn't work with KAGRA and I think this patch fixes it

- initial attempt to automatically disable FAP/FAR assignment until enough statistics have been collected to make it possible

- the density estimation function fails when the array is all 0.  if it's all 0, the density estimation is a no-op, so just skip it.

- (KAGRA support ...)

- need it now so we can make PSD plots.  will probably change when we find out what the official colour is.

gstlal_feature_extractor + related files: added sine-gaussian waveform and made option available to use as basis function for feature extraction

datasource.py + pipeparts: added hacky fix to get around seeking issue for generating fake data at reasonable GPS times, done using the timestamp_offset feature of fakesrc

- because the parent class of the ratebin type is immutable, its out-of-place arithmetic operations don't necessarily return new objects since if the boundaries are identical the object can be re-rused.  but ratebin is not, really, immutable and its own out-of-place arithmetic operations assign values to the internal ._count attribute.  if the parent class' arithmetic methods return references to one or the other of the input arguments then ratebin's methods corrup the input object's count values.
- this patch fixes by ensuring a new object is created in the event the ._count atribute must be assigned a new value.

- fixes "... has no attribute .coincs_document" crashes
- addresses some lingering FIXMEs and removes some cruft

- new package cmath: elements that perform unary operations and handle complex and real floating point arithmetic. Elements included are cabs, cexp, cln, clog, clog10, and cpow.
- new element lal_trackfrequency: base transform element that attempts to measure the loudest frequency in a signal.