bump for 2.8.0 release

implement 'auto' as default CRS for BPF writer PDAL#4418 (PDAL#4428)

Don't attempt to execute tree location for isolated point. (PDAL#4373)

* Don't attempt to execute tree location for isolated point.
Close PDAL#4318

* Perhaps better comment.

Control readers.ept thread queue more carefully to prevent it from fi…

…lling too fast (PDAL#4359)

* Make sure we don't fill the queue between readers and the main thread with too many points.
Close PDAL#4357

* Remove garbage

---------

Co-authored-by: Andrew Bell <[email protected]>

bumps for 2.6.3

bumps for 2.6.2 release

bumps for 2.6.1 release

bump for 2.6.0 release

bumps for 2.5.6 release

Update docs for TileDB stages (PDAL#4079)