TESTS: added tests to cast-test.r reported in Issue #278
TESTS: corrected incorrect test in cast-test.r re: Issue #278
TESTS: additional test case for cast-test.r related to issue #278
FIX: issue #278 (Checking for type-casting in Red-System does not seem to work as described)
FIX: removed type casting from ALLOC_TAIL macro to avoid warnings caused by above fix.
Merge branch 'master' of github.com:dockimbel/Red
TESTS: additional namespace tests to reflect issue #285
FIX: issue #279 (GTK window icon loading corrupted)
Merge branch 'master' of github.com:dockimbel/Red
FIX: type casting from float32! to integer! on literal float value, when assigned to global variable.
TESTS: fixed several typos.
TESTS: disabled invalid test "cast float32! error 8". Casting from float32! to integer! is allowed.
FIX: issue #280 (Casting to function![...] pseudo-type is now allowed; specification says it is not.)
FIX: issue #283 (Pointer types may not have the synonyms int32! and uint8!, but synonym float64! is allowed)
FIX: issue #286 (Minor documentation issues on keywords)
FIX: issue #282 (Context names live in a namespace of their own, and they have preference over other names)
FIX: issue #281 (Contexts may be defined in conditionally executed code-blocks. Other definitions are not allowed there)
TESTS: added test to reflect issue #281 in namespace-test.r
TESTS: added test to namespace-test.r rre Issue #282
FEAT: namespace implementation in Red/System redesigned.

Support code is now cleaner code and much faster (thanks to a new reverse lookup table). This fixes several issues (relative context paths) and limitations for nested namespaces support like having several WITH clauses nested in global context or local ones.

FIX: Red compiler adapted accordingly. Early paths to words conversions removed.
FIX: few absolute paths replaced by relative paths in Red runtime.
Merge branch 'master' of github.com:dockimbel/Red
TESTS: fix WITH test with multiples namespaces (precedence order changed).
TESTS: disabled test for issue #285 (feature will not be implemented).