Return string after 1st char from a set
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 Syntax

        GT_StrpBrk(<cStr>, <cSet>) --> cString

 Arguments:

      <cStr>   - The input string
      <cSet>   - The set of characters to find

 Returns:

      cString  - The input string after the first occurance of any
                 character from <cSet>

 Description:

      Return a string after the first occurance of any character from
      the input set <cSet>.

 Examples:


      ? GT_Strpbrk("This is a test", "sa ")  // prints "s is a test"
      ? GT_Strpbrk("This is a test", "et")   // prints "test"


 Source: STRPBRK.C

 Author:  Andy M Leighton