Merge branch 'save_stackmax' into 'master'

core: save stackmax by tmin_ms

The high frequency ASPO data set (used by Jose) requires short time windows, shorter than 1 second. stackmax traces have therefore repeatedly been overwritten. tmin_ms as file name solves this issue in this case. Using tmin_ns made the trace names lengthy and I don't think anyone needs this (until now at least). Hence, it's a compromise.

See merge request !2

src/core.py

@@ -223,7 +223,7 @@ def scan(
                 return
         
         tr_stackmax.chop(wmin, wmax)
-        io.save([tr_stackmax], 'stackmax/trace_%(tmin)s.mseed')
+        io.save([tr_stackmax], 'stackmax/trace_%(tmin_ms)s.mseed')
 
 
 __all__ = [