Enhanced vxWorks Variable support

[Andrew Johnson <anj@ast.cam.ac.uk>]

I've recently completed some changes to William Lupton's enhanced vxWorks 
Variable device support routines, including adding support for waveform 
records.  The enhancements should be transparent as far as anyone using 
either the original EPICS device support or William's modified version.

With the new version, if the variable name is an indirect reference, with 
or without an array index (e.g.  *pVariable  or  *pArray[5] ) then the 
indirection now occurs at record-processing time rather than record 
initialisation.

Support for waveform records allows a C array of any of the standard types 
to be imported into the database.  As with the support for strings, an 
array index in the variable name controls how far into the array the first 
element of the array is read from.

The new versions of the device support files are available at
	ftp://ftp.ast.cam.ac.uk/pub/anj/devSymb.tar.Z

For details of the functionality read William's comments at the beginning 
of devSymbFind.c

- Andrew
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