The only place where this field was set to a non-zero value was the now
removed fb command, and it was never used for anything sensible. Thus it
is safe to remove.
* 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
