ATS2-0.1.3

## ats2-postiats-0.1.3:

    This is the 12th release of ATS2, the successor of the ATS
    programming language. The compiler for ATS2 is given the name
    ATS/Positats, ATS2/Postiats or simply Postiats.

    The official website for ATS is:

    http://www.ats-lang.org

    ATS-Postiats is hosted at github:

    https://github.com/githwxi/ATS-Postiats

    Major releases of ATS2 are available at:

    https://sourceforge.net/projects/ats2-lang/

    Major releases of external packages for ATS2 are available at:

    https://sourceforge.net/projects/ats2-lang-contrib/

    Here is a list of major additions and changes since the last release:

    1. Adding support for dot-notation overloading in assignments.
       This feature is mostly for interacting ATS with other languages.
       See ATS2TUTORIAL/CHAP_DOTOVERLD for a short article of explanation.
    2. Adding support for functional style o dot-notation overloading.
       This feature makes it very convenient for ATS to interact with OOP.
    3. Generally improving level-2 jsonization (pats_dynexp2_jsonize)
    4. Adding support for extvar decl. (which is different from $extval):
       extval "external_name" = internal_value
    5. ATS_DYNLOADFLAG is set to 1 by default only for DATS-files. So
       dynloading SATS-files is no longer necessary (but it is still harmless).
    6. Adding support for $extmcall(ret_type, obj, "method", arglst),
       which translates into the method invocation: obj.method(arglst)
    7. Adding -D_ATS_ARRAY_FIELD to safe-guard using array fields in records.