develop, openjpeg code relies on removed functions in openjpeg 2.0

[gdevenyi]

Was trying to build, looks like the 2.x series moved/renamed some functions. Successfully builds against 1.5.2

Perhaps should be rolled into superbuild?

[vfonov]

With openjpeg 2.1 I am getting error messages:
dicom_read.c:2482:8: error: unknown type name 'opj_dinfo_t'; did you mean 'opj_tp_info_t'?
static opj_dinfo_t* OPJ_CALLCONV (*_opj_create_decompress)(OPJ_CODEC_FORMAT);

[rdvincent]

I think I may back out this code, or move it to a separate branch. Not worth the trouble.