__PARGRAB2
 Get parameter and grab 2 times it's memory
------------------------------------------------------------------------------

 Function:
 __PARGRAB2:FAR

 Description:
 This is the exact same function as __PARGRAB, except that it allocates two
 times as much memory as the size of the parameter supplied. For operations
 on strings where more than the actual size is required. Also use __RETFREE
 to return the string to Clipper and free the memory.

 Example:
 See __PARGRAB example.
 __PARGRAB2 could be of usage where you need more than the actual space
 of the string. An example is the conversion to Hex, where each character
 translates into 2 characters.