protected.test

Property reform part 1:
- disallow protection modifiers for "properties" and
add new flag "-accessor" to "property" and "variable"
This changes definitions like
Class create C {
:property {a a1}
:public property {b b1}
:protected property {c c1}
:private property {d d1}
}
to
Class create C {
:property {a a1}
:property -accessor public {b b1}
:property -accessor protected {c c1}
:property -accessor private {d d1}
}
since "properties" are always public accessible
over the "configure" and "cget" interface, but the
accessors methods might not be public. The value of
the accessor might be also "none" (specifying explicitely
that no accessor is wanted) or "", which means: use the default.
Same holds for "variable"

- disallow parameter option "incremental" and change it to a flag
of the property or variable. The motivation for this is due to
the fact, that "incremental" is a property of the accessor, and
not of the value.

old:
Class create C {
:property foo:int,incremental
:variable bar:int,incremental
}

new:
Class create C {
:property -incremental foo:int
:variable -incremental bar:int
}

- disallow "public class property" and friends since these are not needed
- removed parameter property "noaccessor"

- removed "nx::configure defaultPropertyCallProtection" and
method hook "__default_property_call_protection"

- introduced "nx::configure defaultAccessor" and
method hook "__default_accessor"

- for the time being, "defaultAccessor" is "public" for NX and XOTcl,
will be changed to "none" in NX

- extended regression test (new file properties.test)