Added another helper function
Added another helper function

--HG--
rename : SFS_helper/isargscalar.m => SFS_helper/isargnumeric.m
extra : convert_revision : svn%3Ae730da3b-c3e2-4fc5-b1ca-054ac94edddb/trunk%40453

sfstoolbox/sfs,sfstoolbox/sfs-matlab