Fix out-of-bounds accesses and modernize some line-number do loops#559

WenMeng-NOAA merged 2 commits into

NOAA-EMC:developNOAA-EMC/UPP:developfrom

SamuelTrahanNOAA:bugfix/out-of-bounds-lcl-mdl2sigmaSamuelTrahanNOAA/UPP:bugfix/out-of-bounds-lcl-mdl2sigmaCopy head branch name to clipboard