\valid(p+i) now additionally checks whether p and p+i point to the same
block

issue #11]

issue #11]

without memory-related predicates but with heap allocation

without memory-related predicates but with heap allocation

    - Restricted internal symbols of Patricia trie memory model to its
        compile unit
    - Restructuring/renaming the files belonging to ADT models
    to make the names consistent with the contents of the files
    - Patricia trie model as a single file

containing the segment-based memory model.