Fix overriding of cdef by cpdef method in .pxd file

Repair calls to fused staticmethods : we currently generate the wrong C signature for them (first arg becomes 'self' arg), so this change works around that by really passing the first argument as 'self'.
Eventually, ths signature should be fixed instead.

restrict "__dict__" property generation to declared "__dict__" attributes and ignore everything else

Closes #531.

Closes github issue #1447.

let pcython script parse the main script arguments and pass them on instead of incorrectly rejecting them as unknown

repair accidental change in macro usage (used to be CPYTHON, was accidentally changed to PYPY in a previous commit)

disable self-argument extraction for lambda functions to revert to old "self in args" argument parsing behaviour

re-enable "profile" and "linetrace" directives at class/function level to allow switching it on and off for specific code sections

Use global constants for default arguments of cpdef functions/methods and def methods in cdef classes as using the CyFunction defaults requires passing the CyFunction as self (which we currently don't do for methods in cdef classes).
Properly fixing this requires changing the call signature of CyFunction.

use global constants for default arguments of cpdef functions (which are static C functions internally)

Re-use, rather than duplicate, error exit code.