FEAT: added new SYSTEM? routine for returning the name of the OS running on (as a word!).

Current resulting values: Windows, Syllable, MacOSX, Linux
FIX: OS-specific fixes and improvements. Console should now work fine on non-Windows platforms too.
FEAT: renamed SYSTEM? routine to PLATFORM?.
FIX: removed libhistory dependency for Mac OS X, so the console can now work (but without history support).
TESTS: added more UNSET!, SET/ANY and GET/ANY tests.
FIX: TAB completion disabled in Readline for console (on non-Windows platforms).
FIX: lit-words were not bound to local context on runtime functions creation.
TESTS: added basic routine tests
FIX: issue #437 (PRINT follows newline with space)
Merge branch 'master' of github.com:dockimbel/Red
FIX: problem when compiling a literal issue! value with same name as a local word.
FIX: inverted position for used and free memory blocks in STATS/INFO.
FEAT: added SYSTEM function.

Refinements:
    /version  : returns a build string with version and timestamp of build
    /words    : returns a fresh block of global context words
    /platform : returns the platform name as a word (replaces PLATFORM? routine)

Example:

red>> system/version
== "0.3.2, 25-Mar-2013/2:03:45+1:00"
red>> system/platform
== Windows
red>> length? system/words
== 290
FEAT: optimized evaluation result output in console to avoid excessive flooding.

Result line now limited to 72 characters max. A trailing three dots sequence will signal a truncation.
Merge branch 'master' into cursdial
FEAT: Menus display program datas and code