now the statements to insert and remove elements from array or
dictionaries are the same, autodetection is made correctly and the
CODEC is kept intact. Dictionary test fixes.

also marginal support for internal types: ecp, ecp2 and big

extend array comparison and hash
as well separate implementation over different source files
remove 'eval' function to improve security

also no need to use of encapsulation decoding in schema

test correctly addresses use of named rather than inside