horizonhistory.py: fix issues with failing doctests, update .gitlab-ci.yml with doctests to skip in gstlal-inspiral

datasource.py: fixed whitespace issue for doctest in injection_dict_from_channel_list_with_node_range

fix more doctests in datasource.py, update .gitlab-ci.yml with more python files to ignore doctests for

gstlal_fake_frames: fix frame output so that output directory names are consistent based on LDG standards

add online feature extractor Makefile, update gstlal_feature_extractor_pipe_online to allow for connections to UWM O2 replay to occur

gitlab-ci.yml: remove condition that allows gstlal-burst build failure since it is working properly now

lal_transferfunction:  Apply resampling and smoothing of transfer functions before matrix manipulations and before making FIR filters.

gstlal_feature_extractor + utils.py: added functionality to increase the sample rate of features being produced above 1 Hz

multichannel_datasource.py: add options for lvshm data source for customization, needed for O2 replay

lal_transferfunction:  Perform checks on FFTs before computing transfer functions, to minimize loss of calculated stuff.

gstlal-burst: add required deps (fftw, orc, gobject-intro) in configure.ac, fix indent issues in gstlal-burst.spec.in

Added documents dependencies that weren't in the gstlal-dev:stretch-mkl container. Added support for burst. 

add gstlal_feature_synchronizer + gstlal_feature_hdf5_sink to gstlal-burst for saving and synchronization of features from extractor