move most functions in variables.cc to octave namespace * variables.h, variables.cc: Move most functions to octave namespace. Provide deprecated inline wrapper functions to preserve old names. Change all uses as needed. (SET_INTERNAL_VARIABLE, SET_NONEMPTY_INTERNAL_STRING_VARIABLE, SET_INTERNAL_VARIABLE_WITH_LIMITS, SET_INTERNAL_VARIABLE_CHOICES): Note that these macros are obsolete. * dirfns.cc, ls-oct-text.cc, pr-flt-fmt.cc, pr-output.cc, svd.cc, ov-base.cc, ov-java.cc, ov-struct.cc, ov-usr-fcn.cc, ov.cc: Eliminate use of SET_INTERNAL_VARIABLE macros.

# line endings in repository match line endings on disc
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