* Remove undo write API, it was not used
* Move seek from IO to Core
* Remove IO undo files
* Fix cursor positionig in visual when doing undo/redo
* Add doxygen doc for rz_core_seek API
* Add cfg.seek.{histsize,silent} evals
* Add unit test for rz_[p]vector_foreach_prev
* Disable colors on Windows because terminal looks bad otherwise
* Use environment on Windows to set PATH and make sure unit tests use
the compiled libraries and not the installed ones
* Define ssize_t on Windows as well by using SSIZE_T
Update test_analysis_block.c
Update test_intervaltree.c
Update test_unum.c
