Minor bug fixes (memleaks, unchecked returns)
Several small bug fixes, each pretty much a one-liner.
The most serious are memory leaks:
- 2 functions in command.c leak
destroot
in several places; - 2 functions in PSF_list.c leak
world_cs
- 2 functions in astrometry_solver.c leak
string_url
The others are just unchecked return values, unimportant but fixed for consistency.
Normally I'd just commit it myself but this close to a release I'll do it as a MR. I do think this should be merged for the rc or 1.2.0 though, to close the memory leaks.