change stats and waveforms .kind to "omitted" for faster document generation.

[ambarb]

We use 5or6 out of 32

[ambarb]

this may also the chances of encountering a missing waveform element when running the FCCD fast, which then breaks analysis code

example traceback is VERY long and summarized by
BadShapeMetadata: For data key fccd_mcs_wfrm_wfrm_1 shape (103,) does not match expected shape (100,).