Rename the 'photons per second' unit to 'photons_per_second'. (#472)

templ_enum.cif

@@ -10,7 +10,7 @@ data_COM_VAL
     _dictionary.title            COM_VAL
     _dictionary.class            Template
     _dictionary.version          1.4.9
-    _dictionary.date             2023-11-13
+    _dictionary.date             2023-11-27
     _dictionary.uri              https://raw.githubusercontent.com/COMCIFS/cif_core/master/templ_enum.cif
     _dictionary.ddl_conformance  4.2.0
     _description.text
@@ -859,7 +859,7 @@ save_units_code
    'counts_per_photon' "measure of gain used in array detectors"
    'counts'            "counts from a detector"
    'counts_per_second' "counts from a detector per second of count time"
-   'photons per second'  "photons registered in one second"
+   'photons_per_second'  "photons registered in one second"
 
    'microseconds_per_angstrom' "TOF coefficient '(seconds * 10^(-6)) * (metres * 10^(-10)^(-1))'"
    'microseconds_per_angstrom_squared' "TOF coefficient '(seconds * 10^(-6)) * (metres * 10^(-10)^(-2))'"
@@ -2350,7 +2350,7 @@ save_
        'electrons_per_angstrom_cubed', 'electrons_per_picometre_cubed' and
        'femtometre_squared' enumeration states in the 'units_code' save frame.
 ;
-         1.4.9                    2023-11-13
+         1.4.9                    2023-11-27
 ;
        # Please update the date above and describe the change below until
        # ready for the next release
@@ -2376,4 +2376,6 @@ save_
        the Greek letter 'alpha'.
 
        Added hertz and counts_per_second to units_code.
+
+       Renamed the 'photons per second' unit to 'photons_per_second'.
 ;