v1.7.0

Fifty-six commits since 1.6.9, and the version had not moved with them.

The substantial additions are GoPro MAX .360 support: dual-fisheye output with the field of view as a parameter, and a time-average straight to a dual-fisheye image that samples before the remap rather than after — about fifteen times faster for an identical result. Both were written for a year of daily standstill recordings and have now run over all 365 of them.

Also fixes a temp-directory leak: the remap-table scratch directories were created in four places and removed in none, and a build over 364 recordings left 22 GB across 348 directories. cv2.imwrite failures are no longer discarded either, which is how a full disk used to surface as a corrupt-looking image several steps later. Three regression tests.

545 tests pass.