BUG: #1734: replace envi format with TIF

Guillaume Paserorequested to merge
1734-fix-hdr-test into develop

Most of the tests using ENVI format images now use TIF instead. Exceptions are limited to IOGDAL and ImageIO modules.

This branch should be tested with the corresponding branch on OTB-Data.

Related to #1734 (closed)

Edited by Guillaume Pasero

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