Missing instantiation for native types `long` and `long long` on some platforms.

[quantumsteve]

Currently one gets a linking error in File::writeData if NumT = long (Win32) or NumT = long long (Linux).

On Windows long has the same length as int32_t, but it is a ​_different_​ type.
On Windows long long has the same length as int64_t, and it is the ​_same_​ type.
http://rextester.com/EEFS42414

On Linux long has the same length as int64_t, and is the ​_same_​ type.
On Linux long long has the same length as int64_t, but is a ​_different_​ type.
http://cpp.sh/7u2t

It would be nice if NeXus handled and did the right thing for the native types long and long long.

[prjemian]

No work on this issue at 2022-06 Code Camp.