Update LALPulsar's minimum requirement for LAL
Description
This MR fixes #499 (closed) by updating the lalpulsar/configure.ac file to require the LAL-7.1.5 as a minimum. That version of LAL includes the changes from !1712 (merged) that are required to support the changes from the same MR in LALPulsar (released first as 3.1.1).
API Changes and Justification
Backwards Compatible Changes
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This change introduces no API changes -
This change adds new API calls
Backwards Incompatible Changes
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This change modifies an existing API -
This change removes an existing API
If any of the Backwards Incompatible check boxes are ticked please provide a justification why this change is necessary and why it needs to be done in a backwards incompatible way.