[PATCH] Write georeferencing to ISCE datasets

[mazhe]

Hello,

Thanks again to accepting the last patch to support input georeferencing from ISCE datasets. Here's now the last bit: adding support for writing georeferencing.

This one is a bit easier to review than the previous.

It also add default for two more properties ("access_mode" and "file_path") defaults to better conform to what ISCE expect from images informations.

Thanks again for allowing us and the scientific communities to use gdal out-of-the box in our interferometric radar processings.

[mazhe]

Support to write georeferencing information to ISCE datasets (whitespace change removed)

[Even Rouault]

In 35249:

ISCE: write georeferencing (patch by mahze, fixes #6634)

[Even Rouault]

Note: I've changed snprintf() calls to CPLsnprintf() since the later use C-locale, which avoid issues when the locale numeric separator is not decimal point