Added auxuliary functions to binary.c

- malelf_binary_get_section_name
- malelf_binary_get_section_by_name
- malelf_binary_get_section
- malelf_binary_get_section32
- malelf_binary_get_section64
Merging with modifications in binary.c

Merge branch 'master' of https://github.com/SecPlus/libmalelf