Fix coverity issues
This MR fixes some issues found by Coverity Scan at https://scan.coverity.com/projects/tallfurryman-kstars/view_defects.
Issues in SEP and Eigen3 were set to ignore. Fix CID258587 - uninit on key array of HTMesh range. Fix CID1342633 - uninit on RangeConvex sign_ in some situations. Fix CID1445642 - leak in Printing in the FOV path exporter. Fix CID1445593 - overflow in strncpy of FITS header keyword. Fix CID1445649 - resource leak in Align closest alignment point finder. Fix CID1445678 - overflow in strncpy of argv in infits. Fix CID1445692 - uninit on imagestats fields. Fix CID1445696 - uninit on fp_unpack hduname. Fix CID1445703 - overflow in strncpy of primaryCCD format. Fix CID1445706 - uninit on ra/dec pulses per pixel. Fix CID1445723 - overflow in strncpy. Fix CID1445738 - overlap in sprintf. Fix CID1445754 - overlap in sprintf. Fix CID1445750 - uninit on dtype.