new Cog VMs are available

CogVM source as per VMMaker.oscog-eem.137/r2508.

Fix primitiveContextAt[Put] for non-contexts (ContextPart subclasses

other than MethodContext including BlockContext).  stObjectAt[Put]

could fail so args should be popped only on success.  Fixes failures

in ClosureCompilerTest>testSourceRangeAccessForBlueBookInjectInto

as of VMMaker.oscog-eem.118.

Add convenient shortPrintFrame:AndNCallers: for debugging.

Make the unix launch script include /lib & /usr/lib in LD_LIBRARY_PATH if

LD_LIBRARY_PATH is unset.  Modify the invocations of ex in the editing scripts

to not read ~/.exrc, and hence not be confused by e.g. set ignorecase.

Fix error codes for at: and at:put: primitive so that for non-indexable

objects they fail with #'bad receiver', not #'bad index'.

Filter-out attempts to create MNU pics with new selectors.  Fixes

Stephane Rollandin's crash of 21/10/2011:

[((Compiler new evaluate: ('Beuh' ifNuk: [yo]))

on: Error       

do: [:ex | ex description]) printString] fork