Database: register NZGD2000 -> ITRF96 transformation for NZGD2000 database

Related to https://github.com/OSGeo/PROJ-data/pull/22

An entry is added in the ``other_transformation`` table, using a raw PROJ
string. Later, once the deformation model has been registered in EPSG, we'll
have to add code to map the EPSG transformation method and parameters to
+proj=defmodel

In the meantime, this works pretty well:

```
$ src/projinfo -s EPSG:4959 -t EPSG:7907
Candidate operations found: 1
-------------------------------------
Operation No. 1:

PROJ:NZGD2000-20180701, NZGD2000 to ITRF96 deformation model, unknown accuracy, New Zealand

PROJ string:
+proj=pipeline +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=axisswap +order=2,1 +step +proj=defmodel +model=nz_linz_nzgd2000-20180701.json +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=rad +xy_out=deg

WKT2:2019 string:
COORDINATEOPERATION["NZGD2000 to ITRF96 deformation model",
    VERSION["20180701"],
    SOURCECRS[
        GEOGCRS["NZGD2000",
            DATUM["New Zealand Geodetic Datum 2000",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,3],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["ellipsoidal height (h)",up,
                    ORDER[3],
                    LENGTHUNIT["metre",1]],
            ID["EPSG",4959]]],
    TARGETCRS[
        GEOGCRS["ITRF96",
            DATUM["International Terrestrial Reference Frame 1996",
                ELLIPSOID["GRS 1980",6378137,298.257222101,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,3],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["ellipsoidal height (h)",up,
                    ORDER[3],
                    LENGTHUNIT["metre",1]],
            ID["EPSG",7907]]],
    METHOD["PROJ-based operation method: +proj=pipeline +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=axisswap +order=2,1 +step +proj=defmodel +model=nz_linz_nzgd2000-20180701.json +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=rad +xy_out=deg"],
    USAGE[
        SCOPE["unknown"],
        AREA["New Zealand"],
        BBOX[-55.95,160.6,-25.88,-171.2]],
    ID["PROJ","NZGD2000-20180701"],
    REMARK["New Zealand Deformation Model. Defines the secular model (National Deformation Model) and patches for significant deformation events since 2000"]]
```

```
$ echo "-41 173 0 2016.5" | PROJ_NETWORK=ON src/cct -d 8 +proj=pipeline +step +proj=unitconvert +xy_in=deg +xy_out=rad +step +proj=axisswap +order=2,1 +step +proj=defmodel +model=nz_linz_nzgd2000-20180701.json +step +proj=axisswap +order=2,1 +step +proj=unitconvert +xy_in=rad +xy_out=deg
 -40.99999402   172.99999938    0.00130333     2016.5000
```

```
$ echo "-41 173 0 2016.5" | PROJ_NETWORK=ON src/cs2cs -f "%.8f" EPSG:4959 EPSG:7907
-40.99999402	172.99999938 0.00130333 2016.5
```

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