Instead of retrying just a single time if the program cannot find the status.json network communication file (e.g. due to network error), it will keep trying to find it indefinitely.

Two features added:
1. If dual CPP pumps are used, these can now be controlled separately (forward or reverse) like a single pump, by setting 'pump_A' or 'pump_B' as the sequence action instead of 'pump'. In the dual pump mode 'pump' alone will work as before, i.e. positive time pump in, negative out.
2. A custom well ordering can now be used, with the wells listed under the top level key 'custom_well_order' in the config file. First and last wells need to be defined in the sequence definition as before.

initial commit

See merge request !1