From SP to IP library

This replaces the SP library with IP. Although some interface bugs were uncovered with this change, the changes turns out to be zero-diff to 1.3.2.

1.3.1

This now provides support for regional applications - thanks for EMC.

Main contribution:

PR #75

1.2.2

This update bring includes the following PRs:

PR #70
PR #71
PR #72

All are minor - and produce zero diff to 3d cases that don't use the q2 option for the moisture variable.