Allow filterbank_header to write headers when the machine is FAKE #2
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There seems to have been a check for whether or not the machine is an actual machine, but ignoring the fact that not every machine has an alias. As a result, when the machine is set to FAKE, filterbank_header was silently refusing to write a header to disk. This changes the check to be such that the machine ID is greater than 0, the only place where I can find that this is not the case is in the preparation of reading psrfits files, at readpsrfits_hd.c#32, which has been changed to 0 as a result.
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There seems to have been a check for whether or not the machine is an actual machine, but ignoring the fact that not every machine has an alias and many pieces of software fallback to FAKE when they don't recognise an input machine ID.
As a result, when the machine is set to FAKE, filterbank_header was silently refusing to write a header to disk. This changes the check to be such that the machine ID is greater than 0.
The only place where I can find that this is not the case is in the preparation of reading psrfits files, at readpsrfits_hd.c#32, which has been changed to 0 as a result to prevent this issue rearing it's head for someone else in the future.
There might be some internal logic I missed that sets the machine ID to 0 to indicate that the parameters are not setup, but I did not find such as case when I did a quick scan through the code base.