meta() support

[chfleming]

Newer versions of ctmm have the meta() command for UD objects (see ?meta). It would be nice to have it supported in ctmmweb. There are two basic ways to use this function. You can either run meta() on a list of all of the individuals, like meta(list(...)), or you can run it on a list of lists, where each sub-list is a group like males or females to compare, like meta(list(male=list(...),female=list(...)).