Fix handling of ::foo

Fix parsing rules of namespaces/classes

Add ability to use ::interface_name in implements

Require abstract classes to be explicitly declared 'abstract', in order to
avoid making developers traverse the entire class/interface hierarchy
before they can figure out whether a class is

Require abstract classes to be explicitly declared 'abstract', in order to
avoid making developers traverse the entire class/interface hierarchy
before they can figure out whether a class is instantiable
(ok, so it makes sense :)

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Add class type hints

Implement $obj::static_func()

Add support for interfaces

Remove legacy code

Add 'final'

Allow namespaces to have a number of parts. I.e., now you can do:
namespace foo {
function abc() {}
}
...
namespace foo {
functio def() {}
}

Whitespace & minor renames

whitespace

add support for ::foo syntax meaning "global one"

Namespace patch. Big changes:
1. Nested classes are gone.
2. New syntax for namespaces:
namespace foo {
class X { ... }
function bar { ... }
var x = 1;

Namespace patch. Big changes:
1. Nested classes are gone.
2. New syntax for namespaces:
namespace foo {
class X { ... }
function bar { ... }
var x = 1;
const ZZ = 2;
}
3. Namespaced symbol access: $x = new foo::X; - etc.
For now, namespaces are case insensitive, just like classes.
Also, there can be no global class and namespace with the same name
(to avoid ambiguities in :: resolution).

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Improve parser handling of 'abstract'

- Treat $this->foo inside class X as an implicit 'public $foo' if X::$foo
is not explicitly declared
- Forbid multiple declaration of the same variable

- Added some missing CVS $Id$ tags, headers and footers.

- Change "is" to "instanceof" as it explains better what the operator means.
- "is_a" was also appropriate but ugly.

Fix writability checks

- Allow variables to have both 'static' modifier and an access level.
NOTE: This only works at the syntax level right now (parser). It
doesn't actually work as of yet - all stati

- Allow variables to have both 'static' modifier and an access level.
NOTE: This only works at the syntax level right now (parser). It
doesn't actually work as of yet - all statics are considered
public for now
- Prevent users from putting more restrictions on methods in derived classes
(i.e., you cannot make a public method private in a derived class, etc.)

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Treat the absence of an access type just as if 'public' was supplied

Remove unintentional code

- Implement public/protected/private methods.
- Prevent instantiation of classes with abstract methods.
Based in part on Marcus's patch.

- FN_IS_STATIC -> FN_STATIC

- Commit Marcus' cleanup of abstract and static inheritance and improve
- error messages