[#76] Add recursive list function
[#76] Add sorted version of modifiyList
[#76] Add gtools as dependency in DESCRIPTION
[#76] Update man files
[#76] Update man files
[#76] Init add/rm_repr
[#76] Update list repr methods
[#76] Add . to list repr
[#76] Add clear branch function
[#76] Add clear branch function
[#76] Add clear branch function
[#76] Add clear branch function
[#76] Fix minor issues
[#76] Update put variable with list repr
[#76] Update delete method with list repr
[#76] Remove get_dims
[#76] Add list match function
[#76] Add support for wild cards in list_match
[#76] Add support for .all in list_match
[#76] Helper function: subset list