based on empirical trial and error:
libmseed w/ STEIM2 encoding crashes when the diff b/w two values is larger than
536870911 (a quarter of the maximum value of the int32 dtype)

(that always annoyed me)

... these jumps (diff of values) are larger then the range of int32.
STEIM1 encoding fixes (at least) these...

That function does all needed:
- check if the array is masked
- fill the mask with specific value
- return a non-masked array

Better use standard functions that doing manually the job

when copy=True do the copy, ALWAYS. To get the previous behaviour simply
pass copy=False or don't call the function at all, because it's not
doing anything

b/c numpy & scipy yields unexpected & unwanted results when the array has a mask

... and allow passing a file *path* to TM.io.readDetections()

+ another fix:  plot right template waveform

... it was the other direction ;-)

+ more docu in TM.core.calc_windowed_std_trace()

read_template modifies the template read from disk, this shouldn't happend.
So the code is moved to prelaod_template

Even though they should be the same, but just to be sure