making a useless commit

wrote some comments

more code to implement class

implementing defclass

added some code to handle defclass

minor indentation fix  in std.c

some code for class instantiation

adding va-count, va-get, va-context for handling variable arguments

added process termination primitives

enhanced compile_return() to handle 'return' differently in a function block containing return variables

writing code for return variables support

writing code to implement return variables

enhancing the compiler to support the variable argument list with the ellipsis

fixed issues related to the new make_block, make_function instruction scheme

updating code to handle the new make_block, make_function scheme

fixing bugs introduced for block temporaries sheme

changing the encoding scheme to store the block temporaries

trying to support variable arguments and return variables

fixed a bug in prepare_new_context() and fork handling

removed two unused variables

fixed a bug of not providing the number of temporaries when arraning the initial context

try-catching working in the top-level now. implemented a way to secure space for top-level temporary variables

coding the compiler to handle an exception variable in the catch part

fixed a flaw in collect_local_vardcl().

updated HCL_PROCESS_NAMED_INSTVARS 12 to 13

simplified code a bit

fixing code to  implement exception handling

added some VM clean-up code to make it more robust

working on try-catch implementation

improving function block and control block handling in the compiler code

more robust error handling in std.c

added a few string formatting functions

attempted to emulate socketpair() where it's unavailable

added hcl_dupucstr(), hcl_dupbcstr()