Update: photobiology 0.3.13

The main changes from version 0.3.12 are:

Add functions sun_elevation(), sun_zenith_angle() and sun_azimuth().
Add convenience functions trim2overlap() and extend2extremes().
Add print() methods for instr_desc and instr_settings classes.
Change threshold for automatic use of hinges when calculating summaries, so that hinges are used by default in more cases.
Allow lists of length zero as argument to w.band, and treat them as equivalent to NULL.
Make argument span = NULL behave in the same way in peak and valley related summary functions as it has for some time in statistics in package ‘ggspectra‘.
Fix bug in the range check for counts per second which triggered warnings too easily.
Change scaling of D2 and FEL spectra so that they are expressed in W m-2 nm-1.

The package is available through CRAN.

Please raise issues concerning bugs or enhancements to this package through Bitbucket at https://bitbucket.org/aphalo/photobiology/issues

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