Track cropping to fit in time window

The import command of larvatagger and similar scripts admits argument --segment that takes a comma-separated pair of timestamps (in seconds; start,end times). This crops the tracks so that they fit in the time segment. Tracks not defined at any point in the time segment are excluded.

scripts/larvatagger

@@ -29,7 +29,7 @@ import|merge|train|predict|--version|-V)
 LarvaTagger
 
 Usage:
-  larvatagger open <file-path> [--backends=<path>] [--port=<number>] [--quiet] [--viewer] [--browser] [--manual-label=<label>]
+  larvatagger open <file-path> [--backends=<path>] [--port=<number>] [--quiet] [--viewer] [--browser] [--manual-label=<label>] [--segment=<t0,t1>]
   larvatagger import <input-path> [<output-file>] [--id=<id>] [--framerate=<fps>] [--pixelsize=<μm>] [--overrides=<comma-separated-list>] [--default-label=<label>] [--manual-label=<label>] [--decode] [--copy-labels]
   larvatagger train <backend-path> <data-path> <model-instance> [--pretrained-model=<instance>] [--labels=<comma-separated-list>] [--sample-size=<N>] [--balancing-strategy=<strategy>] [--class-weights=<csv>] [--manual-label=<label>] [--layers=<N>] [--iterations=<N>] [--seed=<seed>]
   larvatagger train <backend-path> <data-path> <model-instance> --fine-tune=<instance> [--balancing-strategy=<strategy>] [--manual-label=<label>] [--iterations=<N>] [--seed=<seed>]
@@ -56,6 +56,7 @@ Options:
   --layers=<N>         (MaggotUBA) Number of layers of the classifier.
   --iterations=<N>     (MaggotUBA) Number of training iterations (can be two integers separated by a comma).
   --seed=<seed>        Seed for the backend's random number generators.
+  --segment=<t0,t1>    Start and end times (included, comma-separated) for cropping and including tracks.
   --decode             Do not encode the labels into integer indices.
   --copy-labels        Replicate discrete behavior data from the input file.
   --default-label=<label>             Label all untagged data as <label>.