_hyper_max_pole_order

[Erik Panzer]

The hard-coded value

_hyper_max_pole_order := 10;

causes problems, like (Steven Charlton)

hyperInt(polylog(1,u)*polylog(1,u)*polylog(8,u)*(-log(u))^(1)/u^3, u=0..1);

The error message

Error, (in expandInfListInplace) Array index out of range

does not suggest how to fix the problem.

1. Mention how to resolve this (by increasing the value of _hyper_max_pole_order) somewhere in the documentation.
2. Improve the error message to suggest this as a fix.
3. Investigate if the hard-coded limit could be removed altogether.

‌