[local] requires at least one argument

Signed-off-by: Steve Bennett <steveb@workware.net.au>
Support nulls in [exec] immediate redirection

e.g. exec prog <<$data

Signed-off-by: Steve Bennett <steveb@workware.net.au>
Make Jim_IsBigEndian() public

And remove declarations of some obsolete functions

Signed-off-by: Steve Bennett <steveb@workware.net.au>
Fixes to make behaviour of Jim's 'binary' more compliant to Tcl.
Rework binary.tcl in preparation for float support

Signed-off-by: Steve Bennett <steveb@workware.net.au>
Add pack/unpack support for floating point
Add floating point support for [binary]

From work by Vadim Zborovskii

Signed-off-by: Steve Bennett <steveb@workware.net.au>