lvmscp 0.6.5

✨ Improved

• #23 ln2fill abort now creates a lockfile in /data/ln2fill.lock that, if present, prevents new purges or fills. It can be removed with ln2fill clear.
• #23 By default the pressure of the cryostats is checked before a purge or fill. If any camera is above the threshold the purge/fill is aborted.
• Custom configuration is now merged with the default, internal configuration.
• Clean-up how header keywords are compiled and how defaults are set.