* New directory structure

* Added tests ran at startup. Comment first `runScript` line in `setup.praat`
  to turn them off for (slightly) faster boot.

* New scripts:

  - Move boundaries to zero-crossings (procedure, script, batch)

  - Improved "find label" script, underlying code now more general. New helper
    scripts added, but not included in `setup.praat` yet.

  - Detect non-overlapping intervals
* Corrected wrong reference in `warnings.proc`

* Broke apart JSON procedures by subtype
* Restructured setup script, for easier management

* Correction in two-pass pitch detection, fixes #1

* Fixed errors in label extraction script

* Added zeropad procedure to utils
* `view_each` works now with LongSound objects too. Fixes #2