MESHCONVERT: fix typo with util::ArgResult usage

next_result can return a NULL option, next_option would be correct
Merge pull request #88 from Waldteufel/meshconvert-args

MESHCONVERT: fix typo with util::ArgResult usage
DMRECON: use math::algo::round
Merge pull request #90 from Waldteufel/algo-round

DMRECON: use math::algo::round
UMVE: use get_home_dir instead of getenv
Merge pull request #89 from Waldteufel/umve-homedir

UMVE: use get_home_dir instead of getenv
UTIL: Disallow copy of AlignedMemory
UTIL: reorganize path utils
Merge pull request #92 from Waldteufel/util-fs

UTIL: reorganize path utils