[Everyone] warning for psrchive users on Apple M1 / M2

[Willem van Straten]

Hi everyone,

If you start to use psrchive on a new Mac, you may notice error messages
like the following:

inverse_phase maximum iterations exceeded - error=<*yyy.zzz*>us

This is because psrchive uses the "long double" type in various routines
that require more numerical precision than a 64-bit double-precision
floating point can provide; however "long double" is equivalent to "double"
on Apple ARM64

https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms

Until a work-around is implemented, it's best to do your pulsar data
analysis on another machine.

Cheers,
Willem
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