nsf

- 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)

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