libxc-v0.1.3

Fix:

• libxc 6.2.x support
  • the workspace libxc-ffi dependency now sets default-features = false,
    so api-version features are selected exclusively through the libxc
    crate; previously --no-default-features --features api-v6_2 still
    compiled the v7.0 struct layout of xc_func_type and read garbage
    against a v6.2.2 shared library
  • mGGA tau handling: needs_tau() falls back to the functional family for
    pre-v7.0 libraries; zeroed scratch substituted for null lapl/tau inputs
    and for tau-family outputs missing from the layout/output map (libxc
    6.2.x aborts the process otherwise)
  • CI: the v7.0 test workflow now selects dynamic_loading explicitly and
    pins conda-forge libxc to 7.0.*; it previously relied on the implicit
    feature unification fixed above, and conda-forge's default libxc is now
    7.1.2

Enhancement:

• Refresh headers from released libxc tags: xc_funcs_v7.1.h and xc.h
  from 7.1.2 (the v7.1 line is now released upstream as 7.1.0–7.1.2; it was
  previously snapshotted from the unreleased devel branch), and
  xc_funcs_v6.2.h from 6.2.2. XcFuncId enums regenerated.
  • v7.1: add T_HLE17, LDA_C_BJ89, GGA_X_LLP, LDA_C_LP96_B,
    LDA_K_LP96_B, LDA_C_RPAF, HYB_MGGA_XC_COACH,
    MGGA_X_SREGTM_V1/V2/V3; remove MS2BS, MVSB, MVSBS, OPB3LYP
    (present only in the pre-release snapshot, never in a released v7.1)
  • v6.2: remove functional IDs that do not exist in libxc 6.2.2; fix
    LDA_C_1D_CSS -> LDA_C_1D_CSC and LDA_XC_TH_FL -> GGA_XC_TH_FL;
    add MGGA_X_MK00