Updated for Houdini 17.0

Release 7.1.0

1. Updated for Houdini 17.0.
    VEX changes: https://www.sidefx.com/docs/houdini17.0/news/17/vex.html

2. New VEX functions added:

    agentsolvefbik
    attribdataid
    chop
    chopt
    diagonalizesymmetric
    expandvertexgroup
    getpackedtransform
    islpeactive
    packedtransform
    pxnoised
    random_poisson
    sample_circle_ring_uniform
    sample_sphere_shell_uniform
    setpackedtransform
    solvefbik
    surfacedist
    uniquevals

    Tip: to read about new functions quickly, copy the list in empty
    Sublime Text document, set VEX syntax and check documentation helpcards.